Question

简便运算

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Answer 1

2.4×20又3/5 +33.1×7.6
=2.4×(20+0.6) +33.1×(8-0.4)
=48+1.44 +264.8-13.24
=301
4.25×166-42又1/2×14.2 +24×5.75
=4.25×10×16.6-42.5×14.2 +2.4×10×5.75
=42.5×(16.6-14.2) +2.4×57.5
=42.5×2.4 +2.4×57.5
=(42.5+57.5)×2.4
=100×2.4
=240

465×8.2 +465×29.6 -365×37.8
=465×(8.2 +29.6) -365×37.8
=465×37.8 -365×37.8
=(465-365)×37.8
=100×37.8
=3780

3又3/5×14.4 +9.3×32+3.21×36
=3.6×14.4 +9.3×32+3.21×10×3.6
=3.6×(14.4+32.1) +9.3×32
=1.8×2×46.5 +9.3×10×3.2
=1.8×93 +93×3.2
=(1.8+3.2)×93
=5×93
=465

Answer 2

动脑筋自己算吧，小朋友。

Answer 3

Answer 4