| Yechish:Mos ravishda uchchala quvur bo`sh hovuzni x,y,z soatda to`ldirsin. Masala shartiga ko`ra quyidagi sistemani tuzamiz:
Uchchala tenglamani qo`shib yuborsak:
;
Demak,uchchala quvur hovuzni 10 soatda to`ldiriladi.Javob:A
2.4.7-masala.Ishchi har kuni kunlik rejada ko`rsatilganidan 25 ta detal ortiq yasab,uch kunda rejadagi 7 kunda mo`ljallanganidan 15 ta ortiq detal yasadi.Ishchi har kuni nechta detal yasagan?
A)15 B)17 C)40 D)44
Yechish:Ishchi har kuni rejadagiga ko`ra ta detal yasagan bo`lsin.Masala shartiga ko`ra
3(x+25)=7x+15; 3x+75=7x+15; 4x=60; x=15
Demak,rejadagiga ko`ra 25 ta detal ortiq yasagan va 15+25=40 ta.C
2.4.8-masala.Kotlovan qazish uchun ikkita ekskavator ishga solindi.1-ekskavator soatiga 2-ekskavatorga qaraganda 40 kub m ortiq tuproq oladi.1-ekskavator 16 soat,2-ekskavator 24 soat ishladi. Shu vaqt ichida ikkala ekskavatorda 8640kub m tuproq qazib olindi.Har qaysi ekskavator soatiga necha kub metr tuproq qazib olgan?
A)240;200 B)230;140 C)250;190 D)300;250
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