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题型:化简 题类: 难易度:容易
冀教版数学四年级下册第一、二单元综合素质达标
4x + 2x = 13m - 4m = b + b + b + b =
a×4×b = 6×x + 6×y = x·x + y + y =
3a+2a-4a
a+6a-6
5a+2b-2a+3b-3
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