问题
解答题
脱式计算,写出主要计算过程,能用简便算法的要用简便算法.
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答案
①12×
÷3 8 3 4
=12×
×3 8 4 3
=6;
②
+4 9
×95 9
=
+54 9
=5
;4 9
③14÷(
+1 3
)×5 6 3 4
=14÷
×7 6 3 4
=14×
×6 7 3 4
=9;
④3.6-2.8+16.4-7.2
=(3.6+16.4)-(2.8+7.2)
=20-10
=10;
⑤77×
+23×0.84 5
=(77+23)×0.8
=100×0.8
=80.