问题 解答题
能简算的要简算.
1.56×1.7+0.44×1.712.5×(7.2-1.9)×0.80.25×2010+20.10×7530.8÷[(6.34-4.59)×4].
答案

(1)1.56×1.7+0.44×1.7,

=(1.56+0.44)×1.7,

=2×1.7,

=3.4;

(2)12.5×(7.2-1.9)×0.8,

=12.5×5.3×0.8,

=12.5×0.8×5.3,

=10×5.3,

=53;

(3)0.25×2010+20.10×75,

=0.25×2010+2010×0.75,

=2010×(0.25+0.75),

=2010×1,

=2010;

(4)30.8÷[(6.34-4.59)×4],

=30.8÷[1.75×4],

=30.8÷7,

=4.4.

判断题
填空题