7х^2-1.8×7=0
7х^2 - 12.6=0
7х^2=12.6
х^2=1.8
х=V1.8
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7х^2-1.8×7=0
7х^2 - 12.6=0
7х^2=12.6
х^2=1.8
х=V1.8