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脱式计算,能简算的要简算.0.8×6.3-0.8×3.80.125×32×2.50.74×0.990.78÷3.9×4.28.46-2.46÷6(20-0.8×9)×5.7
题目详情
脱式计算,能简算的要简算.
0.8×6.3-0.8×3.8 | 0.125×32×2.5 | 0.74×0.99 |
0.78÷3.9×4.2 | 8.46-2.46÷6 | (20-0.8×9)×5.7 |
▼优质解答
答案和解析
(1)0.8×6.3-0.8×3.8
=0.8×(6.3-3.8)
=0.8×2.5
=2;
(2)0.125×32×2.5
=0.125×(4×8)×2.5
=(0.125×8)×(4×2.5)
=1×10
=10;
(3)0.74×0.99
=0.74×(1-0.01)
=0.74×1-0.74×0.01
=0.74-0.0074
=0.7326;
(4)0.78÷3.9×4.2
=0.2×4.2
=0.84;
(5)8.46-2.46÷6
=8.46-0.41
=8.05;
(6)(20-0.8×9)×5.7
=(20-7.2)×5.7
=12.8×5.7
=72.96.
=0.8×(6.3-3.8)
=0.8×2.5
=2;
(2)0.125×32×2.5
=0.125×(4×8)×2.5
=(0.125×8)×(4×2.5)
=1×10
=10;
(3)0.74×0.99
=0.74×(1-0.01)
=0.74×1-0.74×0.01
=0.74-0.0074
=0.7326;
(4)0.78÷3.9×4.2
=0.2×4.2
=0.84;
(5)8.46-2.46÷6
=8.46-0.41
=8.05;
(6)(20-0.8×9)×5.7
=(20-7.2)×5.7
=12.8×5.7
=72.96.
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