第一题:
4.6 / (2/3) = 6.9
4.6*6.9 = 31.74
第二题:
280/ (1 - 1/5) = 350
第三题:
(2/5) / (4/7) = 7/10
第四题:
2/9 * 3/8 * [ 1 / (2/3) ] = 1/8
第一题:
4.6 / (2/3) = 6.9
4.6*6.9 = 31.74
第二题:
280/ (1 - 1/5) = 350
第三题:
(2/5) / (4/7) = 7/10
第四题:
2/9 * 3/8 * [ 1 / (2/3) ] = 1/8