0.34×12.5+0.125×66怎么简便计算

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0.34×12.5+0.125×66怎么简便计算
0.34×12.5+0.125×66怎么简便计算

0.34×12.5+0.125×66怎么简便计算
=0.34×12.5+12.5×0.66
=12.5×(0.34+0.66)
=12.5×1
=12.5

b=y-a
ab=ay-a²=x
a²-ay+x=0
a=[y±√(y²-4x)]/2
b=y-a
所以
a=[y-√(y²-4x)]/2,b=[y+√(y²-4x)]/2
a=[y+√(y²-4x)]/2,b=[y-√(y²-4x)]/2

=0.34×12.5+12.5×0.66
=12.5×(0.34+0.66)
=12.5×1
=12.5

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