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花朵
共回答了22个问题采纳率:90.9% 举报
(7 / 2)x - (1 / 2)x = 2.4
(7 / 2 - 1 / 2)x = 2.4
3 x = 2.4
x = 0.8
8 / 11 + 7 /15 - 8 / 15
= 8 / 11 + (7 / 15 - 8 / 15)
= 8 / 11 - 1 / 15
= 120 / 165 - 11 / 165
= 109 / 165
7 - (3 / 4 - 1 / 5)
= 7 - 3 / 4 + 1 / 5
= 6 又 1 / 4 + 1 / 5
= 6 又 9 / 20
4 / 5 - (4 / 15 + 1 / 3)
= 4 / 5 - 4 / 15 - 1 / 3
= 8 / 15 - 1 / 3
= 3 / 15
= 1 / 5
4 / 7 + 5 / 21 - 4 / 7 + 2 / 21
= (4 / 7 - 4 / 7)+ (5 / 21 + 2 / 21)
= 0 + 7 / 21
= 1 / 3
1年前
3