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1. (10r²+3p-4r³) + (2r-8p+pr-10p)
= -4r³+10r²+2r-15p+pr
2. (19y³-7y²+6) + (2y³+6y²+y+5)
= 21y³-y²+y+11
3. (6a+7) (2a²+11a)
= 12a³+66a²+14a²+77a
= 12a³+80a²+77a
4. (8xy²-8x+3xy+7) (8xy-7xy²+6x)
= 64x²y³ - 56x²y⁴ + 48x²y² - 64x²y + 56x²y² - 48x² + 24x²y² - 21x²y³ + 18x²y +56xy - 49xy² +42x
= -56x²y⁴ + 43x²y³ + 128x²y² - 46x²y - 48x² - 49xy² + 56xy + 42x (coba dicek lagi ^_^)
5. 3(x+y) = 3x+3y
6. 4(c+d) + 3(3c+2d)
= 4c+4d+9c+6d
= 13c+10d
7. (6w-v)(4w+3)
= 24w²+18w-4wv-3v
8. (2x²-3x+7) (x+1)
= 2x³+2x²-3x²+3x+7x+7
= 2x³-x²+10x+7
10. (x²+6x-5) + ((x-3)(x+5))
= (x²+6x-5) + (x²+2x-15)
= 2x²+8x-20
11. (x+3)²
= (x+3)(x+3)
= x²+6x+9
12. (3b+4)²
= (3b+4)(3b+4)
= 9b²+24b+16
13. (2a-2b+7c)²
= (2a-2b+7c)(2a-2b+7c)
= 4a²-4ab+14ac-4ab+4b²-14bc+14ac-14bc+49c²
= 4a²+4b²+49c²-8ab+28ac-28bc
14. -(a+2b-3c)²
= -[(a+2b-3c)(a+2b-3c)]
= -[a²+2ab-3ac+2ab+4b²-6bc-3ac-6bc+9c²]
= -[a²+4b²+9c²+4ab-6ac-12bc]
= -a²-4b²-9c²-4ab+6ac+12bc
15. (3a-3b-3c)²
= (3a-3b-3c)(3a-3b-3c)
= 9a²-9ab-9ac-9ab+9b²+9bc-9ac+9bc+9c²
= 9a²+9b²+9c²-18ab-18ac+18bc
semoga membantu :)