x²-3x=0 ········
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x²-3x=0········x²-3x=0········x²-3x=0········解x²-3x=0x(x-3)=0∴x=0或x-3=0∴x=0或x=3x
x²-3x=0 ········
x²-3x=0 ········
x²-3x=0 ········
解
x²-3x=0
x(x-3)=0
∴x=0或x-3=0
∴x=0或x=3
x(x-3)=0
∴x=0 或x=3