问题 解答题

递等式计算,能简算的就简算.

(1)1.25×8.08

(2)49.5÷7.5+49.5÷2.5

(3)15.7×1.3+14.3×1.3

(4)(1.8-1.8×0.9)÷(0.38-0.28)

答案

(1)1.25×8.08,

=1.25×(8+0.08),

=1.25×8+1.25×0.08,

=10+0.1,

=10.1;

(2)49.5÷7.5+49.5÷2.5,

=6.6+19.8,

=26.4;

(3)15.7×1.3+14.3×1.3,

=(15.7+14.3)×1.3,

=30×1.3,

=39;

(4)(1.8-1.8×0.9)÷(0.38-0.28),

=1.8×(1-0.9)÷0.1,

=1.8×0.1÷0.1,

=1.8.

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