1) x=13
2) x=2
3) x=3
4) x=5
Пошаговое объяснение:
1) 2(11x-5)-17x=55
22x-10-17x=55
5x-10=55
5x=55+10
5x=65
x=3
2) 5(8х + 3) - 12 = 83;
40x+15-12=83
40x+3=83
40x=83-3
40x=80
x=2
3) 7(2x +9) + 3x = 114:
14x+63+3x=114
17x+63=114
17x=114-63
17x=51
4) 3(4х + 13) - 25 = 74.
12x+39-25=74
12x+14=74
12x=74-14
12x=60
x=5
1). 2(11x-5)-17x=55
2*11x-2*5-17x=55
22x-17x=55+10
x=65:5
x=13
Проверка: 2(11*13-5)-17*13=2(143-5)-221=2*138-221=276-221=55
2).5(8х + 3) - 12 = 83;
5 * (8х + 3) - 12 = 83;
5 * 8х + 5 * 3 - 12 = 83;
40х + 15 - 12 = 83;
40х = 83 + 12 - 15;
40х = 95 - 15;
40х = 80;
х = (40 * 2)/40;
х = 80 : 40;
х = 2.
ответ: х = 2.
3).7(2x +9) + 3x = 114;
7 * 2х + 7 * 9 + 3х = 114
14х + 63+ 3х = 114
14х + 3х + 63 = 114
17х + 63 = 114
17х = 114 - 63
17х = 51
х = 51 : 17
х = 3
Выполняем проверку:
7 * ( 2 * 3 + 9 ) + 3 * 3 = 7 * ( 6 + 9 ) + 9 = 7 * 15 + 9 = 105 + 9 = 114
114 = 114
4).3(4х + 13) - 25 = 74
3 * 4х + 3 * 13 - 25 = 74;
12х + 39 - 25 = 74;
12х = 74 + 25 - 39;
12х = 60;
х = 60/12;
х = 5.
ответ: х = 5.
1) x=13
2) x=2
3) x=3
4) x=5
Пошаговое объяснение:
1) 2(11x-5)-17x=55
22x-10-17x=55
5x-10=55
5x=55+10
5x=65
x=3
2) 5(8х + 3) - 12 = 83;
40x+15-12=83
40x+3=83
40x=83-3
40x=80
x=2
3) 7(2x +9) + 3x = 114:
14x+63+3x=114
17x+63=114
17x=114-63
17x=51
x=3
4) 3(4х + 13) - 25 = 74.
12x+39-25=74
12x+14=74
12x=74-14
12x=60
x=5
Пошаговое объяснение:
1). 2(11x-5)-17x=55
2*11x-2*5-17x=55
22x-10-17x=55
22x-17x=55+10
5x=65
x=65:5
x=13
Проверка: 2(11*13-5)-17*13=2(143-5)-221=2*138-221=276-221=55
2).5(8х + 3) - 12 = 83;
5 * (8х + 3) - 12 = 83;
5 * 8х + 5 * 3 - 12 = 83;
40х + 15 - 12 = 83;
40х = 83 + 12 - 15;
40х = 95 - 15;
40х = 80;
х = (40 * 2)/40;
х = 80 : 40;
х = 2.
ответ: х = 2.
3).7(2x +9) + 3x = 114;
7 * 2х + 7 * 9 + 3х = 114
14х + 63+ 3х = 114
14х + 3х + 63 = 114
17х + 63 = 114
17х = 114 - 63
17х = 51
х = 51 : 17
х = 3
Выполняем проверку:
7 * ( 2 * 3 + 9 ) + 3 * 3 = 7 * ( 6 + 9 ) + 9 = 7 * 15 + 9 = 105 + 9 = 114
114 = 114
4).3(4х + 13) - 25 = 74
3 * 4х + 3 * 13 - 25 = 74;
12х + 39 - 25 = 74;
12х = 74 + 25 - 39;
12х = 60;
х = 60/12;
х = 5.
ответ: х = 5.