99/100= 0.99
если есть вопросы, задавай :)
Ответ:
Пошаговое объяснение:
1) = 12 - 3 = 9
2) = -3 - 12 = -15
3) = -36
4) = 12 + 3 = 15
5) = 9
6) = 3 - 12 = -9
7) = -4
8) = -3 + 12 = 9
9) = 3 + 12 = 15
10) = -9
11) = 3 + 12 = 15
12) = 36
13) = -12 - 3 = -15
14) = 3 - 12 = -9
15) = -4
16) = -9
17) = 12 + 3 = 15
18) = -36
19) = 15
20) = -15
21) = 3 + 12 = 15
22) = -12 + 3 = -9
23) = 9
24) = 3 - 12 = -9
25) = 4
26) = 15
27) = 12 - 3 = 9
28) = 12 - 3 = 9
29) = -15
30) = 12 + 3 = 15
1. 9x+13=6x+4
9х-6х=4-13
3х=-9
Х=-9:3
Х=-3
2.9x=3+4(5x+2)
9х=3+20х+8
9х-20х=3+8
-11х=11
Х=11:(-11)
Х=-1
3.6+7(4x-3)=3x-65
6+28х-21=3х-65
28х-3х=21-6-65
25х=-50
Х=-50:25
Х=-2
4.5(4x+3)-7(4x-7)=24
20х+15-28х+49=24
20х-28х=24-49-15
-8х=-40
Х=-40:(-8)
Х=5
5.1-5(2x-5)-3(2-3x)=4x
1-10х+25-6+9х=4х
9х-10х-4х=6-25-1
-5х=-20
Х=-20:(-5)
Х=4
6.2,1(2-x)+1,4(1,5x-3)=2
4,2-2,1х+2,1х-4,2=2
-2,1х+2,1х=2-4,2+4,2
0х=2
Х=решений нет