问题 解答题
脱式计算,能简算的要简算.
①99×0.625+0.625
②(53.76-17.49)÷1.8
③(0.8×7+4.56÷1.9)×12.5
④15.73-(2.17+0.73)-1.83.
答案

(1)99×0.625+0.625,

=(99+1)×0.625,

=100×0.625,

=62.5;

(2)(53.76-17.49)÷1.8,

=36.27÷1.8,

=20.15;

(3)(0.8×7+4.56÷1.9)×12.5,

=(5.6+2.4)×12.5,

=8×12.5,

=100;

(4)15.73-(2.17+0.73)-1.83,

=15.73-2.17-0.73-1.83,

=(15.73-0.73)-(2.17+1.83),

=15-4,

=11.

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