问题
解答题
脱式计算(能简算的要简算) 1.25×0.25×3.2×1.7 1.3-3.79+9.7-6.21 6×
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答案
(1)1.25×0.25×3.2×1.7,
=1.25×0.25×(0.8×4)×1.7,
=(1.25×0.8)×(0.25×4)×1.7,
=1×1×1.7,
=1.7;
(2)1.3-3.79+9.7-6.21,
=1.3+9.7-3.79-6.21,
=(1.3+9.7)-(3.79+6.21),
=11-10,
=1;
(3)6×
+13÷4-11×25%,1 4
=6×
+13×1 4
-11×1 4
,1 4
=(6+13-11)×
,1 4
=8×
,1 4
=2.