问题
选择题
下列各题去括号所得结果正确的是[ ]
A.x2-(x-y+2z)=x2-x+y+2z
B.x-(-2x+3y-1)=x+2x-3y+1
C.3x-[5x-(x-1)]=3x-5x-x+1
D.(x-1)-(x2-2)=x-1-x2-2
答案
答案：B
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下列各题去括号所得结果正确的是[ ]
A.x2-(x-y+2z)=x2-x+y+2z
B.x-(-2x+3y-1)=x+2x-3y+1
C.3x-[5x-(x-1)]=3x-5x-x+1
D.(x-1)-(x2-2)=x-1-x2-2
答案：B