32.5X2.8十32.5怎样才能简单算?
2个回答
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解:32.5X2.8十32.5等于( 247/2 ),【即等于123.5】
∵已知需求出32.5X2.8十32.5等于多少
A × B + A = A × (B + 1)
∴32.5 X 2.8 十 32.5
= 32.5 × (2.8 + 1)
= (32×10+5)/10 × [(2×10+8)/10 + 1]
= 325/10 × (28/10 + 1)
= 65/2 × (14/5 + 5/5)
= 65/2 × 19/5
= 247/2
= 123.5
答:32.5X2.8十32.5等于( 247/2 ),【即等于123.5】
∵已知需求出32.5X2.8十32.5等于多少
A × B + A = A × (B + 1)
∴32.5 X 2.8 十 32.5
= 32.5 × (2.8 + 1)
= (32×10+5)/10 × [(2×10+8)/10 + 1]
= 325/10 × (28/10 + 1)
= 65/2 × (14/5 + 5/5)
= 65/2 × 19/5
= 247/2
= 123.5
答:32.5X2.8十32.5等于( 247/2 ),【即等于123.5】
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