问题
计算题
计算下面各题,能简便计算的用简便方法计算。 | ||||||
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答案
(1)7.4×9.8-14.5
=7.4×(10-0.2)-14.5
=7.4×10-7.4×0.2-14.5
=74-1.48-14.5
=58.02
=(13.4+17.6)+(5.62+4.38)
=31+10
=41
=6.73×(4.8+5.2)
=6.73×10
=67.3
(4)8.4÷0.6+8.4÷0.4
=84÷6+84÷4
=14+21
=35
=9.6÷8+1.48÷3.7÷8
=1.2+0.05
=1.25
(6)5.8÷[4×(1.34﹣0.14)]
=5.8÷(4×1.2)
=5.8÷4.8
=1.2