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简介:
5.79×0.99
=5.79×(1-0.01)
=5.79×1-5.79×0.01
=5.79-0.0579
=5.7321
1.01×0.86
=(1+0.01)×0.86
=1×0.86+0.01×0.86
=0.86+0.0086
=0.8686
86×2.8+15×2.8
=(86+15)×2.8
=101×2.8
=(100+1)×2.8
=100×2.8+1×2.8
=280+2.8
=282.8
19.8÷0.5-9.8×2
=19.8×2-9.8×2
=(19.8-9.8)×2
=10×2
=20
8.57÷5-3.57÷5
=(8.57-3.57)÷5
=5÷5
=1