原来的分数是:7/8=(7x7x3x3x2)/(8x 7x3x3x2)=882/1008
(7x2x3ⅹ3ⅹ7)/(8x2ⅹ3x3x7)=882/1008∴原来的分数是882/1008。
2×3×3×7=126原来的分母是8×126=1008原来的分子是7×126=882原来的分数是882/1008
7/8=(7×2)/(8×2)=(7×2×3×3)/(8×2×3×3)=(7×2×3×3×7)/(8×2×3×3×7)=882/1008