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2023-10-10 21:27:21
685 + 944 ⋮ 9
2023-10-10 21:09:11
a) 2x - 17 = 35 : 32
2x - 17 = 35 - 2
2x - 17 = 33
= 27
2x = 27 +17
2x = 44
x = 44 :2
vậy x = 22
b, ( 19 - x ) .2 - 20 = 23
= 8
( 19 - x ) .2 = 8 + 20
( 19 - x ) .2 = 28
19 - x = 28 :2
19 - x = 14
x = 19 - 14
vậy x = 5
2023-10-04 21:28:55
2023-10-04 20:26:01
3; 5; 7
2023-10-04 20:23:25
4\(^{x+2}\) - 4\(^x\) = 240
4\(^x\). 4\(^2\) - 4\(^x\) . 1 = 240
4\(^x\). ( 16 - 1 ) = 240
4\(^x\). 15 = 240
4\(^x\) = 240 : 15
4\(^x\) = 16
Vậy x = 2
2023-10-04 20:16:29