A)1 / 2 - (2 / 3×1 / 5) 7 / 30 = ; b) [4 (3 / 7÷9 / 21) - 1 / 5]÷1 / 2 = ; c)3 / 5 1 / 4 - (5 / 7÷25 / 7) = d) 6 / 7 ÷ (4 / 3 - 1 / 2) = ; e) [(11 / 2 - 7 / 2)×4 / 7] - (11 / 42) = ; f)(9 / 2 8 / 13)×?
A)1 / 2 - (2 / 3×1 / 5) 7 / 30 = ; b) [4 (3 / 7÷9 / 21) - 1 / 5]÷1 / 2 = ; c)3 / 5 1 / 4 - (5 / 7÷25 / 7) = d) 6 / 7 ÷ (4 / 3 - 1 / 2) = ; e) [(11 / 2 - 7 / 2)×4 / 7] - (11 / 42) = ; f)(9 / 2 8 / 13)×26 / 5 , .
