用脱式计算下列各题(能简算的要简算) 6.4×1.25×12.5 1.7×9.9+0.17 [(2+2.8
用脱式计算下列各题(能简算的要简算)6.4×1.25×12.51.7×9.9+0.17[(2+2.8)÷0.6-1.5]×0.04....
用脱式计算下列各题(能简算的要简算) 6.4×1.25×12.5 1.7×9.9+0.17 [(2+2.8)÷0.6-1.5]×0.04.
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(1)6.4×1.25×12.5,
=8×0.8×1.25×12.5,
=(8×1.25)×(0.8×12.5),
=10×10,
=100;
(2)1.7×9.9+0.17,
=1.7×9.9+1.7×0.1,
=1.7×(9.9+0.1),
=1.7×10,
=17;
(3)[(2+2.8)÷0.6-1.5]×0.04,
=[4.8÷0.6-1.5]×0.04,
=[8-1.5]×0.04,
=6.5×0.04,
=0.26.
=8×0.8×1.25×12.5,
=(8×1.25)×(0.8×12.5),
=10×10,
=100;
(2)1.7×9.9+0.17,
=1.7×9.9+1.7×0.1,
=1.7×(9.9+0.1),
=1.7×10,
=17;
(3)[(2+2.8)÷0.6-1.5]×0.04,
=[4.8÷0.6-1.5]×0.04,
=[8-1.5]×0.04,
=6.5×0.04,
=0.26.
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