Giải thích các bước giải + Đáp án :
`C_1 :`
`A = (6 - 2/3 + 1/2) - (5 + 5/3 - 3/2) - (3 - 7/5 + 5/2)`
`A = 6 - 2/3 + 1/2 - 5 - 5/3 + 3/2 - 3 + 7/5 - 5/2`
`A = 6 - 5 - 3 - 2/3 - 5/3 + 1/2 + 3/2 - 5/2 + 7/5`
`A = (-2) - 7/3 - 1/2 + 7/5`
`A = (-60)/30 - 70/30 - 15/30 + 42/30`
`A = -103/30`
`C_2 :`
`A = (6 - 2/3 + 1/2) - (5 + 5/3 - 3/2) - (3 - 7/5 + 5/2)`
`A = (36/6 - 4/6 + 3/6) - (30/6 + 10/6 - 9/6) - (30/10 - 14/10 + 25/10)`
`A = 35/6 - 31/6 - 41/10`
`A = 4/6 - 41/10`
`A = 20/30 - 123/30`
`A = -103/30`