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Mathematics in the first grade of junior high school Volume I Tianfu Frontier Solution: 1. Find the sum of 3x +y -5xy and -4xy-y +7x.
I learned this in my freshman year. It's simple.

First find the quadratic form of 3x+the quadratic form of y-5xy. The latter one is calculated by the complete square formula (a+b) squared = Party A +2ab+b or Party A-2AB+B..

One by one, the result is 16x square +8xy-y+y square.

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