问题 解答题
怎样简便就怎样计算.
7.26×1.4+12.74×1.4
1.25×2.5×32
6.8×10.214.9×2.17-4.9×2.17
8.8×0.12536×9.9.
答案

(1)7.26×1.4+12.74×1.4

=(7.26+2.74)×1.4

=10×1.4

=14;

(2)1.25×2.5×32

=1.25×2.5×8×4

=(1.25×8)×(2.5×4)

=10×10

=100;

(3)6.8×10.2

=6.8×(10+0.2)

=68+1.36

=69.36;

(4)14.9×2.17-4.9×2.17

=(14.9-4.9)×2.17

=10×2.17

=21.7;

(5)8.8×0.125

=(8+0.8)×0.125

=8×0.125+0.8×0.125

=1+0.1

=1.1;

(6)36×9.9

=36×(10-0.1)

=36×10-36×0.1

=360-3.6

=356.4.

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