问题
解答题
脱式计算(能用简便方法计算的要用简便方法). 17.5-4.25-5.75 1.68÷(2.4×2-4.6)
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答案
(1)17.5-4.25-5.75
=17.5-(4.25+5.75)
=17.5-10
=7.5;
(2)1.68÷(2.4×2-4.6)
=1.68÷(4.8-4.6)
=1.68÷0.2
=8.4;
(3)
÷[9 36
-(3 4
-7 16
)]1 4
=
÷[9 36
-3 4
]3 16
=
÷9 36 9 16
=
×9 36 16 9
=
.4 9