问题
解答题
脱式计算(能简算的要简算)
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答案
(1)9.8×75+75×0.2,
=(9.8+0.2)×75,
=10×75,
=750;
(2)0.78÷0.25÷40,
=0.78÷(0.25×40),
=0.78÷10,
=7.8;
(3)7.2+2.8×5.06,
=7.2+14.86,
=21.368;
(4)56×10.1,
=56×(10+0.1),
=56×10+5.6×0.1,
=560+0.56,
=560.56.