下列各题运用结合律变形错误的是（）A1+(-0.25)+(-0.75)=1+[(-0.25)+(-0.75)]B1-2+3-4+5-6=(1-2)+(3-4)+(5-6)C3/4-1/6-1/2+2/3=(3/4+1/2)+(-1/6+2/3)D7-8-3+6+2=(7-3)+(-8)+(6+2)

Question

下列各题运用结合律变形错误的是（ ） A 1+(-0.25)+(-0.75)=1
+[(-0.25)+(-0.75)]
B 1-2+3-4+5-6=(1-2)+(3-4)+(5-6)
C 3/4-1/6-1/2+2/3=(3/4+1/2)+(-1/6+2/3)
D 7-8-3+6+2=(7-3)+(-8)+(6+2)

Answer 1

C 应该是(3\4-1\2)+(2\3-1\6)