问题 解答题
脱式计算,能简算的要简算.
(1)8×1.09×1.25(2)1.5×106(3)1.65×4.3+8.35×4.3
(4)3.8+7.19+5.2+3.91(5)118-7.5×(0.14+1.6)(6)1.7÷2.5×0.4.
答案

(1)8×1.09×1.25,

=8×1.25×1.09,

=10×1.09,

=10.9;

(2)1.5×106,

=1.5×(100+6),

=1.5×100+1.5×6,

=150+9,

=159;

(3)1.65×4.3+8.35×4.3,

=(1.65+8.35)×4.3,

=10×4.3,

=43;

(4)3.8+7.19+5.2+3.91,

=(3.8+5.2)+(7.19+3.91),

=9+11.1,

=20.1;

(5)118-7.5×(0.14+1.6),

=118-7.5×1.74,

=118-13.05,

=104.95;

(6)1.7÷2.5×0.4,

=0.68×0.4,

=0.272.

单项选择题
单项选择题