问题
解答题
简便计算 6.5-3.73+3.5-1.27 7×5.3+0.7×47 46×
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答案
(1)6.5-3.73+3.5-1.27
=6.5+3.5-(3.73+1.27),
=10-5,
=5;
(2)7×5.3+0.7×47
=7×5.3+7×4.7,
=7×(5.3+4.7),
=7×10,
=70;
(3)46×7 45
=(45+1)×
,7 45
=45×
+1×7 45
,7 45
=7+
,7 45
=7
.7 45