Question

Решите уравнения: 1) 478- (256 x)=143 2) 659- (354 - x) =427 3) 791 - ( x - 298) = 683 4) 6785 + ( x - 879) = 12637​

Answer 1

Пошаговое объяснение:

256+х=478+143

256+х=621

х=365

345-х=659-427

345-х=232

х=345-232

х=113

х-298=791-683

х-298=108

х=298+108

х=406

Answer 2

1) 478 - (256 + x) = 143 Let's solve this equation step by step: We start by simplifying the expression inside the parentheses: 478 - 256 - x = 143 Next, we subtract 478 - 256 to get: 222 - x = 143 Now, to isolate x, we subtract 222 from both sides of the equation: - x = 143 - 222 - x = -79 Finally, to solve for x, we multiply both sides of the equation by -1: x = 79

2) 659 - (354 - x) = 427 Again, we simplify the expression inside the parentheses: 659 - 354 + x = 427 Next, we subtract 659 - 354 to get: 305 + x = 427 To isolate x, we subtract 305 from both sides of the equation: x = 427 - 305 x = 122

3) 791 - (x - 298) = 683 Simplifying the expression inside the parentheses: 791 - x + 298 = 683 Combining like terms, we get: 1089 - x = 683 To isolate x, we subtract 1089 from both sides of the equation: - x = 683 - 1089 - x = -406 To solve for x, we multiply both sides of the equation by -1: x = 406

4) 6785 + (x - 879) = 12637 Simplifying the expression inside the parentheses: 6785 + x - 879 = 12637 Combining like terms, we get: x + 5906 = 12637 To isolate x, we subtract 5906 from both sides of the equation: x = 12637 - 5906 x = 6731