能简算的用简便方法计算.3.9×1.25 48.7×2.34+48.7×7.66 ...
能简算的用简便方法计算.3.9×1.2548.7×2.34+48.7×7.660.49×9.9....
能简算的用简便方法计算.3.9×1.25 48.7×2.34+48.7×7.66 0.49×9.9.
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(1)3.9×1.25
=(4-0.1)×1.25
=4×1.25-0.1×1.25
=5-0.125
=4.875;
(2)48.7×2.34+48.7×7.66
=48.7×(2.34+7.66)
=48.7×10
=487;
(3)0.49×9.9
=0.49×(10-0.1)
=0.49×10-0.49×0.1
=4.9-0.049
=4.851.
=(4-0.1)×1.25
=4×1.25-0.1×1.25
=5-0.125
=4.875;
(2)48.7×2.34+48.7×7.66
=48.7×(2.34+7.66)
=48.7×10
=487;
(3)0.49×9.9
=0.49×(10-0.1)
=0.49×10-0.49×0.1
=4.9-0.049
=4.851.
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