计算下面各题,能简算的要简算.3.85×2.77+0.723×38.5 ...
计算下面各题,能简算的要简算.3.85×2.77+0.723×38.545×25%+15×14(5.7×2.8+4.3×2.8)×2.5[10一(5+512×2.4)]÷...
计算下面各题,能简算的要简算.3.85×2.77+0.723×38.5 45×25%+15×14(5.7×2.8+4.3×2.8)×2.5 [10一(5+512×2.4)]÷0.05.
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①3.85×2.77+0.723×38.5,
=3.85×2.77+7.23×3.85,
=3.85×(2.77+7.23),
=3.85×10,
=38.5;
②
×25%+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
③(5.7×2.8+4.3×2.8)×2.5,
=2.8×(5.7+4.3)×2.5,
=2.8×10×2.5,
=28×2.5,
=70;
④[10一(5+
×2.4)]÷0.05,
=[10一(5+
×
)]÷0.05
=[10一(5+1)]÷0.05,
=[10一6]÷0.05,
=4÷0.05,
=80.
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