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Đáp án + Giải thích các bước giải:

Câu `13:`

`a)`

`503:y=49` (dư `13`)

`503=49xxy+13`

`503-13=49xxy`

`490=49xxy`

`y=490:49`

`y=10`

`b)`

`(19/32+75/100+18/21+1/4+3/21+13/32):y-75%=2,25`

`((19/32+13/32)+(75/100+1/4)+(18/21+3/21)):y-75/100=225/100`

`(32/32+(3/4+1/4)+21/21):y=225/100+75/100`

`(1+4/4+1)):y=300/100`

`(1+1+1):y=3`

`3:y=3`

`y=3:3`

`y=1`

`c)`

`(26+y)/45=2/3`

`26+y=2/3xx45`

`26+y=30`

`y=30-26`

`y=4`

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