若2x-3y=5,则7-4x+6y=?
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若2x-3y=5,则7-4x+6y=?
若2x-3y=5,则7-4x+6y=?
若2x-3y=5,则7-4x+6y=?
7-4x+6y
=7-2(2x-3y)
=7-2*5
=-3
7-4x+6y
=7-2(2x-3y)
=7-2*5
=7-10
=-3
4x-6y=10
7-4x+6y=4x-6y-7=3
等-3。2*(2x-3y)=10,7-10=-3
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