3/5x4/7十4/5x2/7用简便计算?
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解:3/5x4/7十4/5x2/7等于( 4/7 )
∵已知需求出3/5x4/7十4/5x2/7等于多少
A × B + A × C = A × (B + C)
∴3/5 x 4/7 十 4/5 x 2/7
= 4/7 × 3/5 + 4 ×1/5 × 1/7 × 2
= 4/7 × 3/5 + (4×1/7)×(1/5×2)
= 4/7 × 3/5 + 4/7 × 2/5
= 4/7 × (3/5 + 2/5)
= 4/7 × 5/5
= 4/7 × 1
= 4/7
答:3/5x4/7十4/5x2/7等于4/7
∵已知需求出3/5x4/7十4/5x2/7等于多少
A × B + A × C = A × (B + C)
∴3/5 x 4/7 十 4/5 x 2/7
= 4/7 × 3/5 + 4 ×1/5 × 1/7 × 2
= 4/7 × 3/5 + (4×1/7)×(1/5×2)
= 4/7 × 3/5 + 4/7 × 2/5
= 4/7 × (3/5 + 2/5)
= 4/7 × 5/5
= 4/7 × 1
= 4/7
答:3/5x4/7十4/5x2/7等于4/7
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3/5x4/7十4/5x2/7
=2/7×(6/5+4/5)
=4/7.
=2/7×(6/5+4/5)
=4/7.
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