去括号1.下列去括号中正确的是().A.x+(3y+2)=x+3y-2B.a2-(3a2-2a+1)=a2-3a2-2a+1C.y2+(-2y-1)=y2-2y-1D.m3-(2m2-4m-1)=m3-2m2+4m-12.下列去...
去括号(1)()abc温故而知新(2)()aabaca(4)()aa(3)()aa(5)()aa=（-1）x（3-7）复习旧知-（+5）=+（+5...
