Question

De la 1 la 10 va rog multt multt
CORONITAAA

Answer 1

1.
(a+3)·(-2)=28
a+3=28:(-2)
a+3=-14
a=-14-3
a=-17

2.
a+a+1+a+2=-18
3a+3=-18
3a=-18-3
3a=-21
a=-7

3.
-5·a+(-75)=115
-5a-75=115
-5a=115+75
-5a=190
a=-38

4.
a+b=-150
a-b=-84
--------------(+)
a+b+a-b=-150+(-84)
2a=-234
a=-117
b=-150-(-117)
b=-33
5.
p+c=12
c=3p
p+3p=12
4p=12
p=3 lei
c=12-3
c=9 lei

6.
a+b=120 |·2
2a+5b=360
2a+2b=240
----------------(-)
5b-2b=360-240
3b=120
b=40
a=120-40
a=80

7.
a+b=24
a+2=5·(b-2)
a+2=5b-10
a=5b-12
5b-12+b=24
6b=24+12
6b=36
b=6
a=24-6
b=18

8.
a+b=-21
b+3=a-2+28
b+3=a+26
b=a+23
a+a+23=-21
2a=-21-23
2a=-44
a=-22
b=-21-(-22)
b=-21+22
b=1

9.
a+b=18
a+4=3·[-(b-6)]
a+4=3·(6-b)
a+4=18-3b
a=14-3b
14-3b+b=18
14-2b=18
-2b=14-18
-2b=-4
2b=4
b=2
a=18-2
a=16

10.
a+3=x
a+7=y
a+10=z
x+y+z=a
a+3+a+7+a+10=a
3a+20=a
a-3a=20
-2a=20
a=-10