Question

va rog ..... urgent

Answer 1

6.
a) 2x-4,7=8,53
2x=8,53+4,7
2x=13,23
x=6,615

b) 3x+19,63=42,4
3x=42,4-19,63
3x=22,77
x=7,59

c)0,78+20x=0,9
20x=0,9-0,78
20x=0,12
x=0,006

7. a=(28,2-25,8):12+9,8=2,4:2+9,8=0,2+9,8=10

8.b=[11,2(3)-9,(2)]×9-1/100=(1011/90-83/9)×9-0,01=181/90×9-0,01=
=181/10×9-0,01=18,1-0,01=18,09
11,2(3)=(1123-112)/90=1011/90
9,(2)=(92-9)/9=83/9

9. c=(4,56+16,23-2,39):8=18,4:8=2,3

10. 3a+2b+c=3×10+2×18,09+2,3=30+36,18+2,3=68,48

11.(10+18,09+2,3)/3=30,39/3=10,13

12.[(0,3)²]³·x=(0,09)⁴
(0,09)³·x=(0,09)⁴
x=(0,09)⁴/(0,09)³
x=0,09⁽⁴⁻³⁾=0,09¹=0,09