a+b+c=252a-3b+2c=15,求b已知5x+y=3 与x-2y=5ax=5y=4 5x+by=1 有相同的解,求a、b的值2│5X-2y-3│+(x+6y-11)=0成立,求x、y的值m为何值时 ,3x-5y=2m的解互为相反数,并求出它们的解2x+7y=m-18已知△ABC中,∠B的平分

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