12.5×﹙0.8+0.4﹚×2.5怎么巧算
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12.5×﹙0.8+0.4﹚×2.5怎么巧算12.5×﹙0.8+0.4﹚×2.5怎么巧算12.5×﹙0.8+0.4﹚×2.5怎么巧算12.5×﹙0.8+0.4﹚×2.5=12.5x0.8x2.5+12
12.5×﹙0.8+0.4﹚×2.5怎么巧算
12.5×﹙0.8+0.4﹚×2.5怎么巧算
12.5×﹙0.8+0.4﹚×2.5怎么巧算
12.5×﹙0.8+0.4﹚×2.5
=12.5x0.8x2.5+12.5x0.4x2.5
=10x2.5+12.5x1
=25+12.5
=37.5
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