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# 复习有两个变量的多项式加减

## 例题一

left parenthesis, minus, 7, d, cubed, minus, 5, d, cubed, f, cubed, minus, 3, f, cubed, right parenthesis, minus, left parenthesis, 8, d, cubed, plus, 4, d, cubed, f, cubed, plus, 2, f, cubed, right parenthesis

start color #11accd, minus, 7, d, cubed, minus, 5, d, cubed, f, cubed, minus, 3, f, cubed, end color #11accd, start color #ca337c, minus, 8, d, cubed, minus, 4, d, cubed, f, cubed, minus, 2, f, cubed, end color #ca337c

left parenthesis, start color #11accd, minus, 7, d, cubed, end color #11accd, start color #ca337c, minus, 8, d, cubed, end color #ca337c, right parenthesis, plus, left parenthesis, start color #11accd, minus, 5, d, cubed, f, cubed, end color #11accd, start color #ca337c, minus, 4, d, cubed, f, cubed, end color #ca337c, right parenthesis, plus, left parenthesis, start color #11accd, minus, 3, f, cubed, end color #11accd, start color #ca337c, minus, 2, f, cubed, end color #ca337c, right parenthesis

minus, 15, d, cubed, minus, 9, d, cubed, f, cubed, minus, 5, f, cubed

## 例题二

left parenthesis, u, squared, plus, 5, u, squared, v, plus, 4, u, v, squared, right parenthesis, minus, left parenthesis, u, squared, plus, 5, u, squared, v, squared, plus, 4, u, v, right parenthesis

start color #11accd, u, squared, plus, 5, u, squared, v, plus, 4, u, v, squared, end color #11accd, start color #ca337c, minus, u, squared, minus, 5, u, squared, v, squared, minus, 4, u, v, end color #ca337c

left parenthesis, start color #11accd, u, squared, end color #11accd, start color #ca337c, minus, u, squared, end color #ca337c, right parenthesis, start color #11accd, plus, 5, u, squared, v, plus, 4, u, v, squared, end color #11accd, start color #ca337c, minus, 5, u, squared, v, squared, minus, 4, u, v, end color #ca337c

minus, 5, u, squared, v, squared, plus, 5, u, squared, v, plus, 4, u, v, squared, minus, 4, u, v

## 练习

left parenthesis, minus, 2, x, start superscript, 4, end superscript, plus, 7, x, squared, y, minus, 7, right parenthesis, plus, left parenthesis, minus, 9, x, cubed, plus, 7, x, y, plus, 7, right parenthesis