Question

Rezolvati ecuatiile:[15.(10x-11)-120].10-125=25;100.{10.[(45x-35):5+12].2-21}+17=25 917

Answer 1

( 150x - 165 -120 ) * 10 -125 =25
( 150x - 282 )*10 -125 -25= 0
1500x -2820 -125-25 = 0
1500x - 2970 = 0
1500x = 2970
x= 2970/1500
x= 1,98

100* [ 10* ( 9x -7) +24 -21 ] +17 - 25917 = 0
100 ( 90x -70 + 3 ) - 25900= 0
90000x - 6700 - 25900 = 0
90000x - 32600 = 0
90000x= 32600
x = 32600/90000
x= 3,6(2)

Answer 2

[15(10x-11)-120]*10-125=25
[15(10x-11)-120]*10=25+125
[15(10x-11)-120]*10=150
15(10x-11)-120=150:10
15(10x-11)-120=15
15(10x-11)=15+120
15(10x-11)=135
10x-11=135:15
10x-11=9
10x=9+11
10x=20
x=20:10
x=2

100*{10*[(45x-35):5+12]*2-21}=25917
{10*[(45x-35):5+12]*2-21}=25917:100
10*[(45x-35):5+12]*2-21=259,17
10*[(45x-35):5+12]*2=259,17+21
10*[(45x-35):5+12]*2=280,17(aproxim 280)
10*[(45x-35):5+12]=280:2
10*[(45x-35):5+12]=140
(45x-35):5+12=140:10
(45x-35):5+12=14
(45x-35):5=14-12
(45x-35):5=2
45x-35=2*5
45x-35=10
45x=10+35
45x=45
x=45:45
x=1