69.7*101-69.7和88.8*99+88.8简便运算

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69.7*101-69.7和88.8*99+88.8简便运算

69.7*101-69.7
=69.7*(101-1)
=69.7*100
=6970
88.8*99+88.8
=88.8*(99+1)
=8880

设69.7=a a*101-a*1=a*(101-1)

69.7×101-69.7
=69.7×(101-1)
=69.7×100
=6970
88.8×99+88.8
=88.8×(99+1)
=88.8×100
=8880