Question

Rezolvati ecuatile:
a) x:1.5=0. (6) b) 3 supra 4 +x=5 supra 4

c) 7 supra 3 - x=un intreg 5 sesimi

d) 8 supra 9 ×(2-x)=4 supra 3

Answer 1

a) x:1.5=0. (6)
x/1:15/10=6/9
x/1·10/15=6/9
10x/15=6/9
9·10x=6·15
90x=90
x=90/90
x=1
b) 3 /( 4 +x)=5/4
4·3=5(4+x)
12=20+5x
5x=12-20
5x=-8
x=-8/5

c) 7 /(3 - x)=11/6
7·6=11(3-x)
42=33-11x
-11x=-33+42
-11x=9    (-1)
x=-9/11

d) 8/ 9 ×(2-x)=4/ 3
8/(18-9x)=4/3
8·3=4(18-9x)
24=72-36x
72-36x=24
-36x=24-72
-36x=-48       (-1)
x=48/36=8/6=4/3