Допоможіть ( розбила на частини)
Ответы
Пошаговое объяснение:
497.
1) 21×(18+х)=714
315+21х=714
21х=714 - 315
21х = 399
х = 399 ÷ 21
х = 19
2) 16 × (4х - 34) = 608
64х - 544 = 608
64х = 608 + 544
64х = 1152
х = 1152 ÷ 64
х = 18
3) 12 × (152 + 19х) = 2052
1824 + 228х = 2052
228х = 2052 - 1824
228х = 228
х = 228 ÷ 228
х = 1
4) (152х + 32) × 6 = 192
912х + 192 = 192
912х = 192 - 192
912х = 0
х = 0 ÷ 912
х = 0
498.
1) 8 × (х - 14) = 56
8х - 112 = 56
8х = 56 + 112
8х = 168
х = 168 ÷ 8
х = 21
2) (46 - х) × 19 = 418
874 - 19х = 418
-19х = 418 - 874
-19х = -456
х = -456 ÷ -19
х = 24
3) 9 × (143 - 13х) = 234
1287 - 117х = 234
-117х = 234 - 1287
-117х = -1053
х = -1053 ÷ -117
х = 9
4) 17 × (5х - 16) = 238
85х - 272 = 238
85х = 238 + 272
85х = 510
х = 510 ÷ 85
х = 6
499.
1) 14х + 4х - 48 = 240
18х - 48 = 240
18х = 240 + 48
18х = 288
х = 288 ÷ 18
х = 16
2) 25b - 7b - 9 = 279
18b - 9 = 279
18b = 279 + 9
18b = 288
b = 288 ÷ 18
b = 16
3) 16а - 7а + 96 = 222
9а + 96 = 222
9а = 222 - 96
9а = 126
а = 126 ÷ 9
а = 14
4) 20у + 5у + у + 19 = 227
26у + 19 = 227
26у = 227 - 19
26у = 208
у = 208 ÷ 26
у = 8