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计算各题 能简便运算的要写出简算过程.[1-(14+38)]÷1436×(14+16+19)
问题详情
计算各题,能简便运算的要写出简算过程.
[1-(
36×(
85×
(
参考答案
(1)[1-(14+38)]÷14
=[1-58]÷14
=38÷14
=1.5;
(2)36×(14+16+19)
=36×14+36×16+36×19
=9+6+4
=19;
(3)85×386
=86×386-1×386
=3-386
=28386;
(4)35×17+13×35
=(17+13)×35
=30×35
=18;
(5)(13+14-124)×24
=13×24+14×24-124×24
=8+6-1
=13;
(6)49÷[56-(13-16)]
=49÷[56+16-13]
=49÷[1-13]
=49÷23
=23.
考点:过程