问题
解答题
|
答案
①0.25×4.87×4,
=(0.25×4)×4.87,
=1×4.87,
=4.87,
②1.5×105,
=1.5×(100+5),
=1.5×100+1.5×5,
=150+7.5,
=157.5,
③32×1.25×2.5,
=8×4×1.25×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100,
④5.5×2.3+1.7×5.5,
=(1.7+3.3)×5.5,
=5×5.5,
=27.5.