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【单选题】
下列运算中，错误的是（ ）A.
3x 4 +5x 4 =8x 4
B.
4x 6 -8x 6 =-4
C.
-3x 3 +5x 3 =2x 3
D.
4x 6 -8x 6 =-4x 6
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举一反三
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