3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
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![3x²y-{2x²y-3(2xy-x²y-x²y)-xy}](/uploads/image/z/2765207-47-7.jpg?t=3x%26%23178%3By-%7B2x%26%23178%3By-3%282xy-x%26%23178%3By-x%26%23178%3By%29-xy%7D)
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
3x²y-{2x²y-3(2xy-x²y-x²y)-xy}
=3x²y-(2x²y-6xy+6x²y-xy)
=3x²y-(8x²y-7xy)
=3x²y-8x²y+7xy
=-5x²y+7xy