5/7×2/27+5/7×13/27+2/7×5/9怎么算?
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解:5/7×2/27+5/7×13/27+2/7×5/9等于( 5/9 )
∵已知需求出5/7×2/27+5/7×13/27+2/7×5/9等于多少
∴5/7 × 2/27 + 5/7 × 13/27 + 2/7 × 5/9
= 10/189 + 65/189 + 10/63
= 75/189 + 10/63
= 75/189 + (10×3)/(63×3)
= 75/189 + 30/189
= (75+30)/189
= 105/189
= 5/9
答:5/7×2/27+5/7×13/27+2/7×5/9等于5/9
∵已知需求出5/7×2/27+5/7×13/27+2/7×5/9等于多少
∴5/7 × 2/27 + 5/7 × 13/27 + 2/7 × 5/9
= 10/189 + 65/189 + 10/63
= 75/189 + 10/63
= 75/189 + (10×3)/(63×3)
= 75/189 + 30/189
= (75+30)/189
= 105/189
= 5/9
答:5/7×2/27+5/7×13/27+2/7×5/9等于5/9
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