(-2)-(-3)=-1
(1:2)/(2:3)=3:
(-2)-(-3)=-1
(1/2-1)(1//3-1)=( )*( )=( )
)+1=()-3=()+3=()-2=8-()=()-4=()
(2,2)-(-3/2,1/2)=
(x+3):3=(2x-1):2
化简下列各数:(1)-(-2 1/3)=?(2)-(+5)=?(3)-(-0.25)=?(4)+(-1/3)=?
(1)(2X-3)^2=5(2x-3) (2)(X+1)^2-2
填量词 1()+2()=3()
(-1)+2+(-3)+4.....+(-99)+100=?
计算:3×(1×2+2×3+3×4+...+99×100)=()×()×()
2(x+3)+3(1-x)=0