Question

plz exercitiile 12,13,14 dai coroana inima si steluțe

Answer 1

l-am facut pe 12 dar celelalte exercitii nu incap ca pe brainly poti face o singura fotografie mai bine pui aparte fiecare exercitiu
ex.13
a)4,3x+5=x+10,5
4.3x-x=10.5-5
3.3x=5.5
x=1,(6)
b)5x-6=3,8x+1.8
5x-3,8x=1.8+6
1.2x=7,8
x=6.5
c)3(2x+0,4)-1,8x=0,3x+9
6x-1,8x-0,3x=9-1.2
3,9x=7.8
x=2
d)5.6x+2(0,3x+8.5)=5(x+4)
5,6x+0,6+17=5x+20
5,6x+0,6x-5x=20-17
1,2x=3
x=2.5
e)2x+1.5(x+4)=6-x
2x+1,5x+6=6-x
2x+1,5x+x=6-6
4,5x=0
x=0
f)3x+2(1,8+0,2x)=7,2+0,4x
3x+3,6+0,4x=7,2+0,4x
3x+0,4x-0,4x=7,2-3,6
3x=3,6
x=1,2
g)6,2+0,4(x+0,5)=7(0,2x+0.1)
6.2+0,4x+0,2=1,4x+0,7
0,4x-1,4x=0,7-6,2-0,2
-1x=-5,7
x=5,7
h)2x+1,4(x+5)=2,4(x+5)
2x+1,4x+7=2,4x+12
2x+1,4x-2,4x=12-7
1x=5
x=5
i)15+0,3(6x+5)=x+2(0,4+1)
15+1.8x+1.5=x+0,8+2
16.5+1,8x=x+2,8
1,8x-x=-13,7
0,8x=-13,7
x=-17,125
14.a)
(x÷2-15)×3+11=50
(x pe 2 -15)+3+11=50
x pe 2 -15+3+11=50
x pe 2-1=50
2×x pe 2-2+1=2×50
x-2=100
x=100+2
x=102
b)[(4x+28)7-15]×23=115
(28x+96-15)×23=115
644x+4163=115
644x=115-4163
644x=-4048
x=-6.28
c)12+(3x+5)÷2-32=8
12+(3x+5)pe 2 -32=8
-20+(3x+5)pe 2-32=8
-2×20+2×(3x+5) pe2
-40+3x+5=16
-35+3x=16
3x=16+35
3x=51
x=17