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用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)7.9×12.525.38-1.43-4.38-4.5790+10÷0.4×2.50.8×0.4×(7.6×1.25)×2.52.3×0.48+0.48×8.7-0.12×4;0.1-0.1×[0.01÷(;1-0.9)].

题目详情
用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)
7.9×12.5
25.38-1.43-4.38-4.57
90+10÷0.4×2.5
0.8×0.4×(7.6×1.25)×2.5
2.3×0.48+0.48×8.7-0.12×4;
0.1-0.1×[0.01÷(;1-0.9)].
用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)
7.9×12.5
25.38-1.43-4.38-4.57
90+10÷0.4×2.5
0.8×0.4×(7.6×1.25)×2.5
2.3×0.48+0.48×8.7-0.12×4;
0.1-0.1×[0.01÷(;1-0.9)].
用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)
7.9×12.5
25.38-1.43-4.38-4.57
90+10÷0.4×2.5
0.8×0.4×(7.6×1.25)×2.5
2.3×0.48+0.48×8.7-0.12×4;
0.1-0.1×[0.01÷(;1-0.9)].
用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)
7.9×12.5
25.38-1.43-4.38-4.57
90+10÷0.4×2.5
0.8×0.4×(7.6×1.25)×2.5
2.3×0.48+0.48×8.7-0.12×4;
0.1-0.1×[0.01÷(;1-0.9)].
用递等式计算.(写出必要的计算过程,能简便计算的用简便方法计算)
7.9×12.5
25.38-1.43-4.38-4.57
90+10÷0.4×2.5
0.8×0.4×(7.6×1.25)×2.5
2.3×0.48+0.48×8.7-0.12×4;
0.1-0.1×[0.01÷(;1-0.9)].






▼优质解答
答案和解析
(1)7.9×12.5,
=(8-0.1)×12.5,
=8×12.5-1×12.5,
=100-12.5,
=87.5;

(2)25.38-1.43-4.38-4.57,
=25.38-4.38-1.43-4.57,
=(25.38-4.38)-(1.43-4.57),
=21-6,
=15;

(3)90+10÷0.4×2.5,
=90+25×2.5,
=90+62.5,
=152.5;

(4)0.8×0.4×(7.6×1.25)×2.5,
=(0.8×1.25)×(0.4×2.5)×7.6,
=1×1×7.6,
=7.6;

(5)2.3×0.48+0.48×8.7-0.12×4,
=2.3×0.48+0.48×8.7-0.48,
=0.48×(2.3+8.7-1),
=0.48×10,
=4.8;

(6)0.1-0.1×[0.01÷(1-0.9)],
=0.1-0.1×[0.01÷0.1],
=0.1-0.1×0.1,
=0.1-0.01,
=0.09.
(1)7.9×12.5,
=(8-0.1)×12.5,
=8×12.5-1×12.5,
=100-12.5,
=87.5;

(2)25.38-1.43-4.38-4.57,
=25.38-4.38-1.43-4.57,
=(25.38-4.38)-(1.43-4.57),
=21-6,
=15;

(3)90+10÷0.4×2.5,
=90+25×2.5,
=90+62.5,
=152.5;

(4)0.8×0.4×(7.6×1.25)×2.5,
=(0.8×1.25)×(0.4×2.5)×7.6,
=1×1×7.6,
=7.6;

(5)2.3×0.48+0.48×8.7-0.12×4,
=2.3×0.48+0.48×8.7-0.48,
=0.48×(2.3+8.7-1),
=0.48×10,
=4.8;

(6)0.1-0.1×[0.01÷(1-0.9)],
=0.1-0.1×[0.01÷0.1],
=0.1-0.1×0.1,
=0.1-0.01,
=0.09. (1)7.9×12.5,
=(8-0.1)×12.5,
=8×12.5-1×12.5,
=100-12.5,
=87.5;

(2)25.38-1.43-4.38-4.57,
=25.38-4.38-1.43-4.57,
=(25.38-4.38)-(1.43-4.57),
=21-6,
=15;

(3)90+10÷0.4×2.5,
=90+25×2.5,
=90+62.5,
=152.5;

(4)0.8×0.4×(7.6×1.25)×2.5,
=(0.8×1.25)×(0.4×2.5)×7.6,
=1×1×7.6,
=7.6;

(5)2.3×0.48+0.48×8.7-0.12×4,
=2.3×0.48+0.48×8.7-0.48,
=0.48×(2.3+8.7-1),
=0.48×10,
=4.8;

(6)0.1-0.1×[0.01÷(1-0.9)],
=0.1-0.1×[0.01÷0.1],
=0.1-0.1×0.1,
=0.1-0.01,
=0.09. (1)7.9×12.5,
=(8-0.1)×12.5,
=8×12.5-1×12.5,
=100-12.5,
=87.5;

(2)25.38-1.43-4.38-4.57,
=25.38-4.38-1.43-4.57,
=(25.38-4.38)-(1.43-4.57),
=21-6,
=15;

(3)90+10÷0.4×2.5,
=90+25×2.5,
=90+62.5,
=152.5;

(4)0.8×0.4×(7.6×1.25)×2.5,
=(0.8×1.25)×(0.4×2.5)×7.6,
=1×1×7.6,
=7.6;

(5)2.3×0.48+0.48×8.7-0.12×4,
=2.3×0.48+0.48×8.7-0.48,
=0.48×(2.3+8.7-1),
=0.48×10,
=4.8;

(6)0.1-0.1×[0.01÷(1-0.9)],
=0.1-0.1×[0.01÷0.1],
=0.1-0.1×0.1,
=0.1-0.01,
=0.09. (1)7.9×12.5,
=(8-0.1)×12.5,
=8×12.5-1×12.5,
=100-12.5,
=87.5;

(2)25.38-1.43-4.38-4.57,
=25.38-4.38-1.43-4.57,
=(25.38-4.38)-(1.43-4.57),
=21-6,
=15;

(3)90+10÷0.4×2.5,
=90+25×2.5,
=90+62.5,
=152.5;

(4)0.8×0.4×(7.6×1.25)×2.5,
=(0.8×1.25)×(0.4×2.5)×7.6,
=1×1×7.6,
=7.6;

(5)2.3×0.48+0.48×8.7-0.12×4,
=2.3×0.48+0.48×8.7-0.48,
=0.48×(2.3+8.7-1),
=0.48×10,
=4.8;

(6)0.1-0.1×[0.01÷(1-0.9)],
=0.1-0.1×[0.01÷0.1],
=0.1-0.1×0.1,
=0.1-0.01,
=0.09.