Đáp án: ` = \frac{6250}{13299}`
Giải thích các bước giải:
`\frac{42}{46} + \frac{250}{186} + \frac[-2121}{2323} + \frac{-125125}{143143}`
`= \frac{21}{23} + \frac{125}{93} + \frac{-21}{23} + \frac{-125}{143}`
`= ( \frac{21}{23} + \frac{-21}{23} ) + ( \frac{125}{93} + \frac{-125}{143} )`
` = 0 + \frac{6250}{13299}`
` = \frac{6250}{13299}`