1) 4x - 10 = 3x + 3;
4x - 3x = 3 + 10;
x = 13.
ответ: 13.
2) 25 + 5x = - 5x - 13;
5x + 5x = - 13 - 25;
10x = - 38;
x = - 38 ÷ 10;
x = - 3,8.
ответ: - 3,8.
3) 5 (2x - 4) - (11 - x) = 5;
10x - 20 - 11 + x = 5;
10x + x = 5 + 20 + 11;
11x = 36
x = 36 ÷ 11;
x = 36/11;
x = 3 3/11.
ответ: 3 3/11.
4) - 2 (5 - 2y) + 3 (2 - 5y) = y;
- 10 + 4y + 6 - 15y = y;
4y - y - 15y = 10 - 6;
- 12y = 4;
y = 4 ÷ (- 12);
y = - 4/12;
y = - 1/3.
ответ: - 1/3.
5) 1,2 (5a - 6) = - 4 (0,3a - 0,8);
6a - 7,2 = - 1,2a + 3,2;
6a + 1,2a = 3,2 + 7,2;
7,2a = 10,4;
a = 10,4 ÷ 7,2;
a = 10 2/5 ÷ 7 1/5;
a = 52/5 ÷ 36/5;
a = 52/5 × 5/36;
a = 52 × 5/5 × 36;
a = 13 × 1/1 × 9;
a = 13/9;
a = 1 4/9.
ответ: 1 4/9.
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2) -3,24-(-4,76-2,9)=-3,24+4,76+2,9=8+2,9=10,9
3) 2 7/15 -(2 2/15 - 8 1/9)=14/15-4/15+8/9=10/15+8/9=2/3+8/9=6/9+8/9=14/9= 1 5/9
4) -(4 5/12 - 3 1/6) + 1 5/12=10/12 - 20/12 + 3/6= -10/12 + 1/2= -10/12 + 6/12 = -4/12 = -1/3
2. 1) (-3,2-а)+(а+4,8) = -3,2-а+а+4,8=4,8-3,2=1,6
2) (4,8+а)-(-6,3+а)=4,8+а-а+6,3=11,1
3) (а+5,4)-(4,9+а)=а-а+5,4-4,9=0,5
3. 1) 9,6-(2,6-y) = 4
9,6-2,6+y=4
Y=4-7,6=-3,6
2) -4,2+(x-5,8)=2,5
-4,2+x-5,8=2,5
X-10=2,5
X=12,5
3) -5,4-(x-7,2)=1,9
-5,4+7,2-x=1,9
1,8-x=1,9
X=1,8+1,9=3,7
1) 4x - 10 = 3x + 3;
4x - 3x = 3 + 10;
x = 13.
ответ: 13.
2) 25 + 5x = - 5x - 13;
5x + 5x = - 13 - 25;
10x = - 38;
x = - 38 ÷ 10;
x = - 3,8.
ответ: - 3,8.
3) 5 (2x - 4) - (11 - x) = 5;
10x - 20 - 11 + x = 5;
10x + x = 5 + 20 + 11;
11x = 36
x = 36 ÷ 11;
x = 36/11;
x = 3 3/11.
ответ: 3 3/11.
4) - 2 (5 - 2y) + 3 (2 - 5y) = y;
- 10 + 4y + 6 - 15y = y;
4y - y - 15y = 10 - 6;
- 12y = 4;
y = 4 ÷ (- 12);
y = - 4/12;
y = - 1/3.
ответ: - 1/3.
5) 1,2 (5a - 6) = - 4 (0,3a - 0,8);
6a - 7,2 = - 1,2a + 3,2;
6a + 1,2a = 3,2 + 7,2;
7,2a = 10,4;
a = 10,4 ÷ 7,2;
a = 10 2/5 ÷ 7 1/5;
a = 52/5 ÷ 36/5;
a = 52/5 × 5/36;
a = 52 × 5/5 × 36;
a = 13 × 1/1 × 9;
a = 13/9;
a = 1 4/9.
ответ: 1 4/9.
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