Question

合并同类项,（1)--x-x-x (2) 9ab-4ab+ab-7ab+5ab (3) -12c+6y-3+10x-2-

Answer 1

(1)-x-x-x =(-1-1-1)x=-3x

(2) 9ab-4ab+ab-7ab+5ab=(9-4+1-7+5)ab=4ab

(3) -12x+6y-3+10x-2-y =(-12+10)x+(6-1)y-(3+2)=-2x+5y-5

(4) 5m-7n-8p+5n-9m-p=(5-9)m+(5-7)n-(8+1)p=-4m-2n-9p

(5) x²y²+3xy-7x²y²-5xy/2-1+5x²y²=(1-7+5)x²y²+(3-5/2)xy-1=-x²y²+(1/2)xy-1