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b) 3p-2p+q-5q+7 = p-4q+7
c) 3x²+x²+2x-5x-1+6 = 4x²-3x+5
d) 2x+4y-2xy+10x-15y+25xy = 2x+10x+4y-15y-2xy+25xy
= 12x-11y+23xy
= (2x + 4x - 5y + 8 - 5)
= 6x - 5y + 3
b. ( 3p + q ) + ( -2p -5q +7 )
= (3p - 2p + q - 5q + 7)
= p - 4q + 7
c. ( 3x^2 + 2r - 1 ) + ( x^2 - 5x + 6 )
= (3x^2 + x^2 - 5x + 2r - 1 + 6)
= 4x^2 - 5x + 2r + 5
d. 2 ( x + 2y - xy ) + 5 ( 2x -3y + 5xy )
= (2x + 4y - 2xy) + (10x - 15y + 25xy)
= (2x + 10x + 4y - 15y - 2xy + 25xy)
= 12x - 11y + 23xy
semoga membantu ^_^