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简介：
(1)17.5+13.9+42.5+16.1
=(17.5+42.5)+(13.9+16.1)
=60+30
=90
(2)12.5×3.2×2.5
=(12.5×0.8)×(4×2.5)
=10×10
=100
(3)3.75×4.5+3.75×5.5
=3.75×(4.5+5.5)
=3.75×10
=37.5
(4)3.78×49.5+37.8X6.05一378×0.
=37.8×4.95+37.8×6.05-37.8×1
=37.8×(4.95+6.05-1)
=37.8×10
=378
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