①1/2(8x-6y)+3(y-x/3) ②3(2x-3y)-2(3x-2y) ③2(x²-3xy)-3(y²-2xy)
问题描述:
①1/2(8x-6y)+3(y-x/3) ②3(2x-3y)-2(3x-2y) ③2(x²-3xy)-3(y²-2xy)
①1/2(8x-6y)+3(y-x/3)
②3(2x-3y)-2(3x-2y)
③2(x²-3xy)-3(y²-2xy)
答
①1/2(8x-6y)+3(y-x/3)=4x-3y+3y-x=(4x-x)+(-3y+3y)=3x②3(2x-3y)-2(3x-2y)=6x-9y-6x+4y=(6x-6x)+(-9y+4y)=-5y③2(x²-3xy)-3(y²-2xy)=2x²-6xy-3y²+6xy=2x²-3y²