问题
解答题
怎样简便就怎样算.
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答案
①5.5×17.3+2.7×5.5,
=5.5×(17.3+2.7),
=5.5×20,
=110;
②1.25×(6.2-5.9)×80,
=1.25×0.3×80,
=1.25×80×0.3,
=100×0.3,
=30;
③1.5×99,
=1.5×(100-1),
=1.5×100-1.5×1,
=150-1.5,
=148.5;
④70.3-17.48÷7.6,
=70.3-2.3,
=68;
⑤3.64÷52×23.3,
=0.07×23.3,
=1.631;
⑥4.6×(1-0.25)+0.75×5.4,
=4.6×0.75+0.75×5.4,
=(4.6+5.4)×0.75,
=10×0.75,
=7.5.