3 + 4(5х – 3) = 4х + 7 3(5х – 7) – 7(4х + 5) = х
2(6х – 5) – 7(3х – 5) = 4х – 1
–12x + 4(x – 3) = – 8x – 12
6|х| − 7 = 2|х|
8|х − 4| = 2
|5 − |х|| = 3
227
428
Ответы на вопрос:
x = 1
x = -4
x = 2
x = 1
x1 = -7/4. x2 = 7/4
x1 = 15/4. x2 = 17/4
x1 = -8. x2 = -2. x3 = 2. x4 = 8
1) 3+5(5х-3)=4х+7
3+20х-12=4х+7
-9+20х=4х+7
20х-4х=7+9
16х=16
х=1
2) 3(5х-7)-7(4х+5)=х
15х-21-28х-35=х
-13х-56=х
-13х-х=56
-14х=56
х=-4
3) 2(6х-5)-7(3х-5)=4х-1
12х-10-21х+35=4х-1
-9х+25=4х-1
-9х-4х=-1-25
-13х=-26
х=2
4)-12х+4(х-3)=-9х-12
-12х+4х-12=9х-12
-12х+4х=9х
-8х=9х
-8х-9х=0
-17х=0
х=0
5) 6|х|-2|х|=7
4|х|=7
|х|= 7/4
х=7/4; х=-7/4
6) 8|х-4|=2
|х-4|=1/4
х-4=1/4
х-4=-1/4
х1=17/4
х2=15/4
7) |5-|х||=3
5-|х|=3
5-|х|=-3
х1=2; х2=-2; х3=8; х4=-8
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