Question

cum se calculeaza ecuatiile:
1)7(x+1/5)=1 3/4
2)1,5(x+2/9)=2,25
3)14/9(x-1)=7/4
4)3/4-5/6 x(imultire) x=1/4

Answer 1

1)7(x+1/5)=1 3/4
7x+7/5=7/4
7x=7/4-7/5
7x=(35-28)/20
7x=7/20
140x=7
x=1/20

2)1,5(x+2/9)=2,25
3/2(x+2/9)=9/4
3x/2+1/3=9/4
18x+4=27
18x=23
x=23/18

3)14/9(x-1)=7/4
14x/9-14/9=7/4
56x-56=63
56x=119
x=119/56

4)3/4-5x/6=1/4
9-10x=3
-10x=-6
x=6/10=3/5