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一元二次方程、用公式法解25道用公式法解一元二次方程、25道题、谢谢了
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一元二次方程、用公式法解25道
用公式法解一元二次方程、25道题、谢谢了
用公式法解一元二次方程、25道题、谢谢了
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答案和解析
十字相乘法(3)x^2-2x-80=0 答案：x1=-8 x2=10 过程 (x+8)(x-10)
(4)x^2+10x-200=0 答案：x1=-20 x2=10 (x+20)(x-10)
(5)x^2-20x+96=0 答案：x1=12 x2=8 (x-12)(x+8)
(6)x^2+23x+76=0 答案：x1=-19 x2=-4 (x+19)(x+4)
(7)x^2-25x+154=0 答案：x1=14 x2=11 (x-14)(x+1)
(8)x^2-12x-108=0 答案：x1=-6 x2=18 (x-6)(X+18)
(9)x^2+4x-252=0 答案：x1=14 x2=-18 (x+14)(x-18)
(10)x^2-11x-102=0 答案：x1=17 x2=-6 (x-17)(x+6)
(11)x^2+15x-54=0 答案：x1=-18 x2=3 (x+18)(x-3)
(12)x^2+11x+18=0 答案：x1=-2 x2=-9 x+2 *x+9
(13)x^2-9x+20=0 答案：x1=4 x2=5 x-4 * x-5
(14)x^2+19x+90=0 答案：x1=-10 x2=-9 x+10 * x+9
(15)x^2-25x+156=0 答案：x1=13 x2=12 x-13 * x-12
16)x^2-22x+57=0 答案：x1=3 x2=19 x+3 * x-19
(17)x^2-5x-176=0 答案：x1=16 x2=-11 x-16 * x+11
(18)x^2-26x+133=0 答案：x1=7 x2=19 x-7 * x-19
(19)x^2+10x-11=0 答案：x1=-11 x2=1 x+1 * x-11
(20)x^2-3x-304=0 答案：x1=-16 x2=19 x+16 * x-19
(21)x^2+13x-140=0 答案：x1=7 x2=-20 x+20 * x-7
(22)x^2+13x-48=0 答案：x1=3 x2=-16 x+16 * x-3
23)x^2+5x-176=0 答案：x1=-16 x2=11 x+16* x-11
(24)x^2+28x+171=0 答案：x1=-9 x2=-19 x+9 * x+19
25)x^2+14x+45=0 答案：x1=-9 x2=-5 x+9 * x+5
(26)x^2-9x-136=0 答案：x1=-8 x2=17 x+8 * x-17
27)x^2-15x-76=0 答案：x1=19 x2=-4 x+4 * x-19
28)x^2+23x+126=0 答案：x1=-9 x2=-14 x+9 * x+14
29)x^2+9x-70=0 答案：x1=-14 x2=5 x+14 * x-5
(30)x^2-1x-56=0 答案：x1=8 x2=-7 x+8 * x-7
(31)x^2+7x-60=0 答案：x1=5 x2=-12 x+12 * x-5
(32)x^2+10x-39=0 答案：x1=-13 x2=3 x+13 * x-3
33)x^2+19x+34=0 答案：x1=-17 x2=-2 x+17 * x+2
(34)x^2-6x-160=0 答案：x1=16 x2=-10 x+10 * x-16
(35)x^2-6x-55=0 答案：x1=11 x2=-5 x+5 * x-11
(36)x^2-7x-144=0 答案：x1=-9 x2=16 x+9 * x-16
(37)x^2+20x+51=0 答案：x1=-3 x2=-17 x+3 * x+17
(38)x^2-9x+14=0 答案：x1=2 x2=7 x-2 * x-7
(39)x^2-29x+208=0 答案：x1=16 x2=13 x-16 * x-13
(40)x^2+19x-20=0 答案：x1=-20 x2=1 x+20 * x-1
41)x^2-13x-48=0 答案：x1=16 x2=-3 x+3 * x-16
(42)x^2+10x+24=0 答案：x1=-6 x2=-4 x+6 * x+4
(43)x^2+28x+180=0 答案：x1=-10 x2=-18 x+10 * x+18
(44)x^2-8x-209=0 答案：x1=-11 x2=19 x+11 * x-19
(45)x^2+23x+90=0 答案：x1=-18 x2=-5 x+18 * x+5
(46)x^2+7x+6=0 答案：x1=-6 x2=-1 x+6 * x+1
(47)x^2+16x+28=0 答案：x1=-14 x2=-2 x+14 * x+2
48)x^2+5x-50=0 答案：x1=-10 x2=5 x+5 * x-10
(49)x^2+13x-14=0 答案：x1=1 x2=-14 x+14 * x-1
(50)x^2-23x+102=0 答案：x1=17 x2=6 x-17 * x-6
(51)x^2+5x-176=0 答案：x1=-16 x2=11 x+11 * x-16
(52)x^2-8x-20=0 答案：x1=-2 x2=10 x+2 * x-10
(53)x^2-16x+39=0 答案：x1=3 x2=13 x-3 * x-13
(54)x^2+32x+240=0 答案：x1=-20 x2=-12 x+20 * x+12
(55)x^2+34x+288=0 答案：x1=-18 x2=-16 x+18 * x+16
(56)x^2+22x+105=0 答案：x1=-7 x2=-15 x+7 * x+15
(57)x^2+19x-20=0 答案：x1=-20 x2=1 x+20 * x-1
(58)x^2-7x+6=0 答案：x1=6 x2=1 x-6 * x-1
(59)x^2+4x-221=0 答案：x1=13 x2=-17 x+17 * x-13
(60)x^2+6x-91=0 答案：x1=-13 x2=7 x+13 * x-7
(4)x^2+10x-200=0 答案：x1=-20 x2=10 (x+20)(x-10)
(5)x^2-20x+96=0 答案：x1=12 x2=8 (x-12)(x+8)
(6)x^2+23x+76=0 答案：x1=-19 x2=-4 (x+19)(x+4)
(7)x^2-25x+154=0 答案：x1=14 x2=11 (x-14)(x+1)
(8)x^2-12x-108=0 答案：x1=-6 x2=18 (x-6)(X+18)
(9)x^2+4x-252=0 答案：x1=14 x2=-18 (x+14)(x-18)
(10)x^2-11x-102=0 答案：x1=17 x2=-6 (x-17)(x+6)
(11)x^2+15x-54=0 答案：x1=-18 x2=3 (x+18)(x-3)
(12)x^2+11x+18=0 答案：x1=-2 x2=-9 x+2 *x+9
(13)x^2-9x+20=0 答案：x1=4 x2=5 x-4 * x-5
(14)x^2+19x+90=0 答案：x1=-10 x2=-9 x+10 * x+9
(15)x^2-25x+156=0 答案：x1=13 x2=12 x-13 * x-12
16)x^2-22x+57=0 答案：x1=3 x2=19 x+3 * x-19
(17)x^2-5x-176=0 答案：x1=16 x2=-11 x-16 * x+11
(18)x^2-26x+133=0 答案：x1=7 x2=19 x-7 * x-19
(19)x^2+10x-11=0 答案：x1=-11 x2=1 x+1 * x-11
(20)x^2-3x-304=0 答案：x1=-16 x2=19 x+16 * x-19
(21)x^2+13x-140=0 答案：x1=7 x2=-20 x+20 * x-7
(22)x^2+13x-48=0 答案：x1=3 x2=-16 x+16 * x-3
23)x^2+5x-176=0 答案：x1=-16 x2=11 x+16* x-11
(24)x^2+28x+171=0 答案：x1=-9 x2=-19 x+9 * x+19
25)x^2+14x+45=0 答案：x1=-9 x2=-5 x+9 * x+5
(26)x^2-9x-136=0 答案：x1=-8 x2=17 x+8 * x-17
27)x^2-15x-76=0 答案：x1=19 x2=-4 x+4 * x-19
28)x^2+23x+126=0 答案：x1=-9 x2=-14 x+9 * x+14
29)x^2+9x-70=0 答案：x1=-14 x2=5 x+14 * x-5
(30)x^2-1x-56=0 答案：x1=8 x2=-7 x+8 * x-7
(31)x^2+7x-60=0 答案：x1=5 x2=-12 x+12 * x-5
(32)x^2+10x-39=0 答案：x1=-13 x2=3 x+13 * x-3
33)x^2+19x+34=0 答案：x1=-17 x2=-2 x+17 * x+2
(34)x^2-6x-160=0 答案：x1=16 x2=-10 x+10 * x-16
(35)x^2-6x-55=0 答案：x1=11 x2=-5 x+5 * x-11
(36)x^2-7x-144=0 答案：x1=-9 x2=16 x+9 * x-16
(37)x^2+20x+51=0 答案：x1=-3 x2=-17 x+3 * x+17
(38)x^2-9x+14=0 答案：x1=2 x2=7 x-2 * x-7
(39)x^2-29x+208=0 答案：x1=16 x2=13 x-16 * x-13
(40)x^2+19x-20=0 答案：x1=-20 x2=1 x+20 * x-1
41)x^2-13x-48=0 答案：x1=16 x2=-3 x+3 * x-16
(42)x^2+10x+24=0 答案：x1=-6 x2=-4 x+6 * x+4
(43)x^2+28x+180=0 答案：x1=-10 x2=-18 x+10 * x+18
(44)x^2-8x-209=0 答案：x1=-11 x2=19 x+11 * x-19
(45)x^2+23x+90=0 答案：x1=-18 x2=-5 x+18 * x+5
(46)x^2+7x+6=0 答案：x1=-6 x2=-1 x+6 * x+1
(47)x^2+16x+28=0 答案：x1=-14 x2=-2 x+14 * x+2
48)x^2+5x-50=0 答案：x1=-10 x2=5 x+5 * x-10
(49)x^2+13x-14=0 答案：x1=1 x2=-14 x+14 * x-1
(50)x^2-23x+102=0 答案：x1=17 x2=6 x-17 * x-6
(51)x^2+5x-176=0 答案：x1=-16 x2=11 x+11 * x-16
(52)x^2-8x-20=0 答案：x1=-2 x2=10 x+2 * x-10
(53)x^2-16x+39=0 答案：x1=3 x2=13 x-3 * x-13
(54)x^2+32x+240=0 答案：x1=-20 x2=-12 x+20 * x+12
(55)x^2+34x+288=0 答案：x1=-18 x2=-16 x+18 * x+16
(56)x^2+22x+105=0 答案：x1=-7 x2=-15 x+7 * x+15
(57)x^2+19x-20=0 答案：x1=-20 x2=1 x+20 * x-1
(58)x^2-7x+6=0 答案：x1=6 x2=1 x-6 * x-1
(59)x^2+4x-221=0 答案：x1=13 x2=-17 x+17 * x-13
(60)x^2+6x-91=0 答案：x1=-13 x2=7 x+13 * x-7
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