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请用简便方法计算下面各题245-65-35186+82+18-8625×(4×27)8×(25+20)24×56+44×24700÷4÷25389-(289+27)562+306432-205125×24×8×372×9942×10242×19+4236×101-3636×46+36×36+36×18179-64-36+2147×121-21×4725×36
题目详情
请用简便方法计算下面各题
245-65-35 | 186+82+18-86 | 25×(4×27) | 8×(25+20) |
24×56+44×24 | 700÷4÷25 | 389-(289+27) | 562+306 |
432-205 | 125×24×8×3 | 72×99 | 42×102 |
42×19+42 | 36×101-36 | 36×46+36×36+36×18 | 179-64-36+21 |
47×121-21×47 | 25×36 |
▼优质解答
答案和解析
(1)245-65-35
=245-(65+35)
=245-100
=145;
(2)186+82+18-86
=(186-86)+(82+18)
=100+100
=200;
(3)25×(4×27)
=25×4×27
=100×27
=2700;
(4)8×(25+20)
=8×25+8×20
=200+160
=360;
(5)24×56+44×24
=24×(56+44)
=24×100
=2400;
(6)700÷4÷25
=700÷(4×25)
=700÷100
=7;
(7)389-(289+27)
=389-289-27
=100-27
=73;
(8)562+306
=562+300+6
=862+6
=868;
(9)432-205
=432-200-5
=232-5
=227;
(10)125×24×8×3
=(125×8)×(24×3)
=1000×72
=72000;
(11)72×99
=72×(100-1)
=72×100-72
=7200-72
=7428;
(12)42×102
=42×(100+2)
=42×100+42×2
=4200+84
=4284;
(13)42×19+42
=42×(19+1)
=42×20
=840;
(14)36×101-36
=36×(100+1)-36
=36×100+36-36
=36×100
=3600;
(15)36×46+36×36+36×18
=36×(46+36+18)
=36×100
=3600;
(16)179-64-36+21
=(179+21)-(64+36)
=200-100
=100;
(17)47×121-21×47
=47×(121-21)
=47×100
=4700;
(18)25×36
=25×4×9
=100×9
=900.
=245-(65+35)
=245-100
=145;
(2)186+82+18-86
=(186-86)+(82+18)
=100+100
=200;
(3)25×(4×27)
=25×4×27
=100×27
=2700;
(4)8×(25+20)
=8×25+8×20
=200+160
=360;
(5)24×56+44×24
=24×(56+44)
=24×100
=2400;
(6)700÷4÷25
=700÷(4×25)
=700÷100
=7;
(7)389-(289+27)
=389-289-27
=100-27
=73;
(8)562+306
=562+300+6
=862+6
=868;
(9)432-205
=432-200-5
=232-5
=227;
(10)125×24×8×3
=(125×8)×(24×3)
=1000×72
=72000;
(11)72×99
=72×(100-1)
=72×100-72
=7200-72
=7428;
(12)42×102
=42×(100+2)
=42×100+42×2
=4200+84
=4284;
(13)42×19+42
=42×(19+1)
=42×20
=840;
(14)36×101-36
=36×(100+1)-36
=36×100+36-36
=36×100
=3600;
(15)36×46+36×36+36×18
=36×(46+36+18)
=36×100
=3600;
(16)179-64-36+21
=(179+21)-(64+36)
=200-100
=100;
(17)47×121-21×47
=47×(121-21)
=47×100
=4700;
(18)25×36
=25×4×9
=100×9
=900.
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