(4x-7y)-(3x+2y)
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(4x-7y)-(3x+2y)(4x-7y)-(3x+2y)(4x-7y)-(3x+2y)原式=4x-7y-3x-2y=(4x-3x)-(7y+2y)=x-9y合并同类项
(4x-7y)-(3x+2y)
(4x-7y)-(3x+2y)
(4x-7y)-(3x+2y)
原式=4x-7y-3x-2y=(4x-3x)-(7y+2y)=x-9y
合并同类项
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(4x-7y)-(3x+2y)
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