58.9×2.5+7.5简算怎么算？
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58.9×2.5+7.5 简便计算
= 58.9×2.5+3×2.5
= (58.9+3)×2.5
= 61.9×2.5
= 62×2.5 - 0.1×2.5
= 60×2.5 + 2×2.5 - 0.25
= 150 + 5 - 0.25
= 155 -0.25
= 154.75
= 58.9×2.5+3×2.5
= (58.9+3)×2.5
= 61.9×2.5
= 62×2.5 - 0.1×2.5
= 60×2.5 + 2×2.5 - 0.25
= 150 + 5 - 0.25
= 155 -0.25
= 154.75
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