A Упражнения
Решите уравнения (80—83):
2) 67 - 21у - 25;
502;
80. 1) 43.x + 72
4) 83 +29x
982.
3) 19y - 200 = 47;
81. 1) (x +58) – 37 = 91;
2) (63 - у) + 109 - 121;
3) 69 - (у - 28) = 13;
4) 103 - (2 +47)
(2 +47) 54.
82. 1) 321 + (х + 13) 450;
2) 122 + (у – 7) - 200;
3) 204 - (х + 29) = 100;
4) 53
(у - 13)
83. 1) (x - 23) : 14 = 56;
2) (200 + х): 12 32;
3) 205 : (у – 27) = 41;
4) 729 : (с - 15) = 81;
5) 89 - (b + 13) = 7120;
6) 12 : (97 - 2) = 240.
24.
. А
32
B
1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3
1. 390 : (4х + 3) = 26 2. 528 : (5х - 7) = 16
4х + 3 = 390 : 26 5х - 7 = 528 : 16
4х + 3 = 15 5х - 7 = 33
4х = 15 - 3 5х = 33 + 7
4х = 12 5х = 40
х = 12 : 4 х = 40 : 5
х = 3 х = 8
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3. 594 : (8х - 55) = 18 4. 735 : (6х + 17) = 21
8х - 55 = 594 : 18 6х + 17 = 735 : 21
8х - 55 = 33 6х + 17 = 35
8х = 33 + 55 6х = 35 - 17
8х = 88 6х = 18
х = 88 : 8 х = 18 : 6
х = 11 х = 3