问题 解答题
简便计算.
9.9×4.5

108×1.25

14.67×101-14.67
1.25×3.2×250.125×4.8×2.528.7×9.9+2.87.
答案

(1)9.9×4.5

=(10-0.1)×4.5

=10×4.5-0.1×4.5

=45-0.45

=44.55

(2)108×1.25

=(100+8)×1.25

=100×1.25+8×1.25

=125+10

=135

(3)14.67×101-14.67

=14.67×(101-1)

=14.67×100

=1467

(4)1.25×3.2×25

=1.25×8×0.4×25

=(1.25×8)×(0.4×25)

=10×10

=100

(5)0.125×4.8×2.5

=0.125×8×0.6×25

=(0.125×8)×(0.6×25)

=1×15

=15

(6)28.7×9.9+2.87

=2.87×(99+1)

=2.87×100

=287

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