问题 解答题
脱式计算(能简算的要简算)
9.8×75+75×0.2             0.78÷0.25÷407.2+2.8×5.06                 56×10.1.
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.

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