Помогите пожалуйста!!!
1) 2×(х+1)-1/2×(9-х)=1/5×(3х+10)+8;
2)1/2(1/2у-5/7)=3 1/2у+1 1/2; спасибо зарание
1) 2×(х+1)-1/2×(9-х)=1/5×(3х+10)+8;
2)1/2(1/2у-5/7)=3 1/2у+1 1/2; спасибо зарание
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Answers & Comments
а)
2х+2- 9/2 +1/2х=3/5х+2+8
2 1/2х-3/5х=2+8-2+9/2
19/10 х= 12 1/2
х= 25/2 ÷ 19/10= 25/2 × 10/19= 125/19=6 11/19
х=6 11/19
б)
1/4у-5/14=3 1/2у+1 1/2
1/4у-3 1/2у=1 1/2+5/14
-3 1/4у=1 12/14=1 6/7
у= 1 6/7÷(-3 1/4)
у= 13/7×(-13/4)=-169/28=-6 1/28