脱式计算,能用简便算法的要用简便算法.
5.4×
+3.6÷+0.978×
6-
3+
×[
-(
-
)]
[47-(18.875-1÷
)]÷0.46×
.
人气:351 ℃ 时间:2019-12-13 10:13:16
解答
①5.4×910+3.6÷109+0.9=5.4×0.9+3.6×0.9+0.9×1=0.9×(5.4+3.6+1)=0.9×10=9;②78×379=(79-1)×379=79×379−379×1=3-379=27679;③6-314+34=3+3+34-334=3+[(3+34)-334]=3;④59×[34-(716-14)]=59×...
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