Решите уравнение : 1) 3*(5-х)=21; 2)(х-4)*6=18; 3)2*(4х-9)-5=1; 4)7*(2х-3)-23=12.
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Ответы на вопрос:
Відповідь:
1) 3*(5-х)=21
5-x=7
x=-2
2)(x-4)*6=18
x-4=3
x=7
3)2*(4х-9)-5=1
2(4x-9)=6
4x-9=3
4x=12
x=3
4)7(2х-3)-23=12
7(2х-3)=35
2x-3=5
2x=8
x=4
Покрокове пояснення:
1) 3 * 5 - х = 21;
5 - x = 21/3;
5 - x = 7;
5 - x = 7;
5 - x = -7;
x = 5 - 7;
x = 5 + 7;
x = -2;
x = 12.
2) х - 4 * 6 = 18;
x - 4 = 18/6;
x - 4 = 3;
x - 4 = 3;
x - 4 = -3;
x = 3 + 4;
x = -3 + 4;
x = 7;
x = 1.
3) 2 * 4 * х - 9 - 5 = 1;
2 * 4 * x - 9 = 1 + 5;
2 * 4 * x - 9 = 6;
4 * x - 9 = 6/2;
4 * x - 9 = 3;
4 * x - 9 = 3;
4 * x - 9 = -3;
4 * x = 3 + 9;
4 * x = -3 + 9;
4 * x = 12;
4 * x = 6;
x = 3;
x = 3/2.
4) 7 * 2 * х - 3 - 23 = 12;
7 * 2 * x - 3 = 35;
2 * x - 3 = 5;
2 * x - 3 = 5;
2 * x - 3 = -5;
2 * x = 8;
2 * x = -2;
x = 4;
x = -1.
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