Математика 5 класс 1) 2(11x-5)-17x=552)5(8x+3)-12=833)7(2x+9)+3x=1144)3(4x+13)-25=74

1) 2 * (11x - 5) - 17x = 55;

22х - 10 - 17х = 55;

5х - 10 = 55;

5х = 55 + 10;

5х = 65;

х = 65 : 5;

х = 13;

2 * (11 * 13 - 5) - 17 * 13 = 55;

2 * 138 - 221 = 55:

276 - 221 = 55;

55 = 55;

2) 5 * (8x + 3) - 12 = 83;

40х + 15 - 12 = 83;

40х + 3 = 83;

40х = 83 - 3;

40х = 80;

х = 80 : 40;

х = 2;

5 * (8 * 2 + 3) - 12 = 83;

5 * 19 - 12 = 83;

95 - 12 = 83;

83 = 83;

3) 7 * (2x + 9) + 3x = 114;

14х + 63 + 3х = 114;

17х = 114 - 63;

17х = 51;

х = 51 : 17;

х = 3;

7 * (2 * 3 + 9) + 3 * 3 = 114;

7 * 15 + 9 = 114;

 105 + 9 = 114;

114 = 114;

4) 3 * (4x + 13) - 25 = 74;

12х + 39 - 25 = 74;

12х + 14 = 74;

12х = 74 - 14;

12х = 60;

х = 60 : 12;

х = 5;

3 * (4 * 5 + 13) - 25 = 74;

3 * 33 - 25 = 74;

99 - 25 = 74;

74 = 74.