Question

Va rog tot exercitiul cu calcule,urgent,va implor,ssi asezati si cum ati calculat,e urgeeent!!!

Answer 1

a) 2,5x+3=9,75
2,5x=6,75
x=6,75:2,5
x=2,7
S={2,7}
b) 0,25x+1=1,5
0,25x=0,5
x=0,5:0,25
x=2
S={2}
c) 0,(2)x+0,5=0,75
2/9·x=0,25
x=1/4:2/9
x=1/4·9/2
x=9/8
x=1,125
S={1,125}
d)5/3·x+2/9=4/3 |·9
15x+2=12
15x=10
x=10/15
x=2/3
S={0,(6)}
e)2,5 +1/4·x=5
1/4·x=2,5
x=2,5:1/4
x=2,5·4
x=10
S={10}
f)2x-1,4=2,5
2x=3,9
x=3,9:2
x=1,95
S={1,95}
g)0,(1)x-3=5 1/4
1/9·x=8 1/4
1/9·x=33/4 |·9
x=297/4
x=74 1/4
x=74,25
S={74,25}
h)2/3·x-1=1,(3)
2/3·x-1=4/3 |·3
2x-3=4
2x=7
x=7/2
S={3,5}
i)5/6·x-3/2=0,25 |·6
5x-9=1,5
5x=10,5
x=2,1
S={2,1}
j)x:2/11=22/5
x=22/5·11/2
x=11/5·11
x=121/5
S={24,2}
k)5x:25/8=0,25
5x=0,25·25/8
x=0,25·25/8:5
x=0,25·5/8
x=1,25/8
x=0,15625
S={0,15625}
l)5/6·x:3/2=0,25
5/6·x·2/3=1/4
5/9·x=1/4
x=1/4:5/9
x=1/4·9/5
x=9/20
x=0,45
S={0,45}
m)11/15:x=22/5
x=11/15:22/5
x=11/15·5/22
x=1/6
S={1/6}
n)11/4:x=33/8
x=11/4:33/8
x=11/4·8/33
x=2/3
S={0,(6)}
o)21/4:2x=49/8
2x=21/4:49/8
2x=21/4·8/49
2x=6/7
x=3/7
S={3/7}