2 câu trả lời
Đáp án+Giải thích các bước giải:
`12/25+21/25`
`=(12+21)/25`
`=33/25`
`21/20+3/5`
`=21/20+12/20`
`=(21+12)/20`
`=33/20`
`111/121+3/11`
`=111/121+33/121`
`=(111+33)/121`
`=144/121`
`5/7+7/5`
`=25/35+49/35`
`=(25+49)/35`
`=74/35`
Đáp án:
`12/25 + 21/25`
`=(12+21)/25`
`=33/25`
`5/7 + 7/5`
`=25/35+49+35`
`=(25+49)/35`
`=74/35`
`21/20 + 3/5`
`=21/20 + 12/20`
`=(21+12)/20`
`=33/20`
`111/121 + 3/11`
`=111/121 + 33/121`
`=(111+33)/121`
`=144/121`