12.8×0.75+2.5×1.28简便运算
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12.8×0.75+2.5×1.28简便运算12.8×0.75+2.5×1.28简便运算12.8×0.75+2.5×1.28简便运算12.8×0.75+2.5×1.28=1.28×7.5+1.26×2
12.8×0.75+2.5×1.28简便运算
12.8×0.75+2.5×1.28简便运算
12.8×0.75+2.5×1.28简便运算
12.8×0.75+2.5×1.28
=1.28×7.5+1.26×2.5
=1.28×（7.5+2.5）
=1.28×10
=12.8
12.8×0.75+2.5×1.28简便运算
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