Question

Ecuatiile incercuite,va rog este urgent!!
dau 36 de puncte,dar va rog sa imi faceti pe o foaie cu rezolari clasa a 5a , va rog din suflet,este foarte urgent

Answer 1

c) 2x-38.1=4.7
2x-38.1-4.7=0
2x-42.8=0
2x=42.8
x=42.8:2
x=21.4
j)0.24y=0.36
y=0.36:0.24
y=1.5
l)6z-4=3z+3.11
6z-4-3z-3.11=0
3z-4-3.11=0
3z-7.11=0
3z=7.11
z=7.11:3
z=2.37
n)0.2(3x-5.5)+7.4x=5(x+0.8)
0.6x-1.1+7.4x=5x+4
0.6x-1.1+7.4x-5x-4=0
0.6x+7.4x-5x-1.1-4=0

3x=5.1
x=1.7
p)x*0.75+0.3(0.5x+1.25)=1.59+1.2²
0.75x+0.15x+0.375=1.59+1.44
0.9x+0.375-1.59-1.44=0

0.9x=2.655
x=2.655:0.9
x=2.96(1)

Answer 2

c)2x-38,1=4,7
2x=4,7+38,1
2x=42,8
x=42,8÷2
x=21,4
j)0,24y=0,36
y=0,36÷0,24
y=1,5
l)6z-4=3z+3,11
6z-3z=3,11+4
3z=7,11
z=7,11÷3
z=2,37
n)0,2(3x-5,5)+7,4x=5(x+0,8)
0,6x-1,1+7,4x=5x+4
8x-5x=4+1,1
3x=5,1
x=5,1÷3
x=1,7
p)x·0,75+0,3(0,5x+1,25)=1,59+1,2²
x·0,75+0,15x+0,375=1,59+1,44
x·0,90=3,03-0,375
x·0,90=2,655
x=2,655÷0,90
x=2,95