问题
解答题
|
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