Сумму многочленов.
1. (0,3а-1,2b)+(a-b)-(1,3a-0,2b)
2. (11p³-2p²)-(p³-p²)+(-5p²-3p³)
3. (5x²+6x³)+(x³-x²)-(-2x³+4x²)
4. (-2x³+xy²)+(x²y-1)+(x²y-xy²-3x³)
5. (3x²+5xy+7x²y)-(5xy+3x²)-(7x²y-3x²)
6. (8a²-10ab-b²)+(-6a²+2ab-b²)-(a²-8ab+4b²)​

Объяснение:

1)0,3а-1,2b)+(a-b)-(1,3a-0,2b)=0.3a-1,2b+a-b-1.3a+0,2b=-2b

2)11p³-2p²)-(p³-p²)+(-5p²-3p³)=11p³-2p²-p³+p²-5p²-3p³=7p³-6p²

3)5x²+6x³)+(x³-x²)-(-2x³+4x²)=5x²+6x³+x³-x²+2x³-4x²=9x³

4)(-2x³+xy²)+(x²y-1)+(x²y-xy²-3x³)=-2x³-xy²+x²y-1+x²y-xy²-3x³=-5x³-2xy²-1=5x³+2xy²+1

5)3x²+5xy+7x²y)-(5xy+3x²)-(7x²y-3x²)=3x²+5xy+7x²y-5xy-3x²-7x²y-3x²=-3x²

6)8a²-10ab-b²)+(-6a²+2ab-b²)-(a²-8ab+4b²)​=8a²-10ab-b²-6a²+2ab-b²-a²+8ab-4b²=a²-6b²

1. (0,3а-1,2b)+(a-b)-(1,3a-0,2b) = 0,3а-1,2b+a-b-1,3a+0,2b = -2b

2. (11p³-2p²)-(p³-p²)+(-5p²-3p³) = 11p³-2p²-p³+p²-5p²-3p³= 7p³-6p²

3. (5x²+6x³)+(x³-x²)-(-2x³+4x²) = 5x²+6x³+x³-x²+2x³-4x²=9x³

4. (-2x³+xy²)+(x²y-1)+(x²y-xy²-3x³) = -2x³+xy²+x²y-1+x²y-xy²-3x³ = -5x³+2x²y-1

5.(3x²+5xy+7x²y)-(5xy+3x²)-(7x²y-3x²) = 3x²+5xy+7x²y-5xy-3x²-7x²y+3x² = 3x²

6. (8a²-10ab-b²)+(-6a²+2ab-b²)-(a²-8ab+4b²) = 8a²-10ab-b²-6a²+2ab-b²-a²+8ab-4b² = a²-6b²