1) (х-1 1/3):1 5/12=4/51 2) 21/25*5/7-3/16х=11/20. Created by ulianam1. matematika-ru

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Amigo3

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1) (х-1 1/3):1 5/12=4/51 =(х-4/3)*12:17=4/51⇒х-4/3=4*17/(51*12)=1/9⇒х=1/9+4/3=1/9+12/9=13/9.

2) Будем считать, что х относится к знаменателю и пример имеет вид: 21/25*5/7-3/(16*х)=11/20
21/25*5/7-3/(16*х)=11/20⇒0,6-3/(16*х)=11/20⇒3/(16*х)=0,6-11/20=0,6-0,55=0,05⇒16*х=3/0,05⇒х=3/(0,05*16)=3,75.

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ulianam1 спасибо)

sedinalana

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1) (х-1 1/3):1 5/12=4/51
x-1 1/3=4/51*1 5/12=4/51*17/12
x-1 1/3=1/9
x=1 1/3+1/9=1 3/9+1/9
x=1 4/9

2) 21/25*5/7-3/16х=11/20
3/5-3/16x=11/20
3/16x=3/5-11/20=12/20-11/20
3/16x=1/20
x=1/20:3/16=1/20*16/3
x=4/15

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