Ответ:
188.
а)8х-9-4х+5=12х-6-5х
4х-7х=9-6-5
-3х=-2
х=2/3
б) 4+8у+8=2у-10-7у+9
8у+5у=-1-12
13у=-13
у=-1
в) -20z+28=25-16z-12+2z-6z
28=13 ~~
g) 27u+36-18u-39+6u-22=5*(3u-5)
17u-25=15u-25
2u=0
u=0
189.
a) 5(x-3)-2(x-7)+7(2x+6)=7
5x-15-2x+14+14x+42=7
17x=7-41
17x=-34
x=-2
b) 11(y-4)+10(5-3y)-3(4-3y)=4
11y-44+50-30y-12+9y=4
-10y=4+6
-10y=10
y=-1
v) 5(8z-1)-7(4z+1)+8(7-4z)=9
40z-5-28z-7+56-32z=9
-20z=9-44
-20z=-35
z=35/20=7/4
g) 10(3x-2)-3(5x+2)+5(11-4x)=25
30x-20-15x-6+55-20x=25
-5x=25-29
-5x=-4
x=4/5
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Answers & Comments
Ответ:
188.
а)8х-9-4х+5=12х-6-5х
4х-7х=9-6-5
-3х=-2
х=2/3
б) 4+8у+8=2у-10-7у+9
8у+5у=-1-12
13у=-13
у=-1
в) -20z+28=25-16z-12+2z-6z
28=13 ~~
g) 27u+36-18u-39+6u-22=5*(3u-5)
17u-25=15u-25
2u=0
u=0
189.
a) 5(x-3)-2(x-7)+7(2x+6)=7
5x-15-2x+14+14x+42=7
17x=7-41
17x=-34
x=-2
b) 11(y-4)+10(5-3y)-3(4-3y)=4
11y-44+50-30y-12+9y=4
-10y=4+6
-10y=10
y=-1
v) 5(8z-1)-7(4z+1)+8(7-4z)=9
40z-5-28z-7+56-32z=9
-20z=9-44
-20z=-35
z=35/20=7/4
g) 10(3x-2)-3(5x+2)+5(11-4x)=25
30x-20-15x-6+55-20x=25
-5x=25-29
-5x=-4
x=4/5