Đáp án `+` Giải thích các bước giải:

a)

`5/8 * 3/13 * 10/13 - 9/7`

`= 75/676 - 9/7`

`= 525/4732 - 6084/4732`

`= -1 827/4732 `

b)

`4/5 * 7/17 * (-4/5) * 10/17 + 9/5`

`= [4/5 * (-4/5)] * (7/17 * 10/17) + 9/5`

`= (-16/25) * 70/289 + 9/5`

`= (-1120/7225) + 9/5`

`= (-1120/7225) + 13005/7225`

`= 1 932/1445`

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