问题
解答题
能简算的要简算.
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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.