Question

rezolvati urmatoarele ecuati unde x este numar zecimal :
a) 1-x=0,3 b) 3,56=x=4 c) 10,4 -x =9 d) 7,5 +x =8,25
e) 3,56+x =4,2 f) x+7=7,7 g) x-8,31=1 h) 2,5 .x=0.25
i) 0,74x=7,4 j) 1,19 .x =1190 k)x.1,6=1600
l) x.0,09 =9 m) x.5=0,05 n) 8:x=0,2 la a treia o) x:10 =0,6

Va rog mult de tot dau 27 de puncte si coroana

Answer 1

a)1-x=0.3
1+−x=0.3−x+1=0.3
−x+1−1=0.3−1−x=−0.7
$\frac{-x}{-1} = \frac{-0.7}{-1}$
x=0.7
b)3.56x=4
$\frac{3.56x}{3.56} = \frac{4}{3.56}$
x=1.123596
c) 10,4 -x =9 
10.4+−x=9−x+10.4=9
−x+10.4−10.4=9−10.4−x=−1.4
$\frac{-x}{-1} = \frac{-1.4}{-1}$
x=1.4
d)7.5+x=8.25
x+7.5=8.25
x+7.5−7.5=8.25−7.5x=0.75
e)3.56+x=4.2
x+3.56=4.2
x+3.56−3.56=4.2−3.56x=0.64
f)x+7=7.7
x+7−7=7.7−7x=0.7g)x−8.31=1
x−8.31+8.31=1+8.31x=9.31
h)2.5x=0.25
$\frac{2.5x}{2.5} = \frac{0.25}{2.5}$
x=0.1
i)0.74x=7.4
$\frac{0.74x}{0.74} = \frac{7.4}{0.74}$
x=10
j)1.19x=1190
$\frac{1.19x}{1.19} = \frac{1190}{1.19}$
x=1000
k)x(0.1)(0.6)=1600
0.06x=1600
$\frac{0.06x}{0.06} = \frac{1600}{0.06}$
x=26666.666667
l)x(0)(0.09)=9
0=9
m)x(0.5)=0.05
0.5x=0.05
$\frac{0.5x}{0.5} = \frac{0.05}{0.5}$
x=0.1
n)8:x=0,2³
8x=0.008
$\frac{8x}{8} = \frac{0.008}{8}$
x=0.001
o)x:10 =0,6 
10x=0.6
$\frac{10x}{10} = \frac{0.6}{10}$
x=0.06