作业帮x²-22/5=21/5=0x²-22/5+21/5=0
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x²-22/5=21/5=0x²-22/5+21/5=0
x²-22/5=21/5=0
x²-22/5+21/5=0
x²-22/5=21/5=0x²-22/5+21/5=0
x²-22/5+21/5=0
5x²-22+21=0
(5x-7)(x-3)=0
x1=7/5 x2=3