问题 解答题
脱式计算,能简算的要简算.
13.4+5.62+17.6+4.383.4÷[(1.2+0.5)×5]
0.75×18÷0.152.5×3.2×1.25.
答案

(1)13.4+5.62+17.6+4.38,

=(13.4+17.6)+(5.62+4.38),

=31+10,

=41.

(2)3.4÷[(1.2+0.5)×5],

=3.4÷[1.7×5],

=3.4÷8.5,

=0.4.

(3)0.75×18÷0.15,

=13.5÷0.15,

=90.

(4)2.5×3.2×1.25,

=(2.5×0.4)×(8×1.25),

=1×10,

=10.

单项选择题
单项选择题