0=x²-17x+60;
x-12=0 x-5=0
x= 12 x= 5
0=x²-0,4x
0,4x= x×x
0,4=x
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0=x²-17x+60;
x-12=0 x-5=0
x= 12 x= 5
0=x²-0,4x
0,4x= x×x
0,4=x