(x-1)^2:5^21=25^30.5
(x-1)^2=25^30.5.5^21
=(5^2)^30.5^22
= 5^60.5^22
(x-1)^2 =5^82
(x-1)^2=(5^41)^2
x-1=5^41
x=5^41+1
2.3^x+1=10.3^12+8:3^12
2.3^x+1=10+8=18
3^x+1=18/2=9
3^x+1=3^2
x+1=2
x=1
giup minh voi 2.3 mu x = 10.3 mu 12+ 8. 2 mu4
1) chung to rang
a) 76 + 75 - 74 chia het cho 11
b )278 - 321 chia het cho 26
c) 812 - 2 33 - 230 chia het cho 55
2) tim chu so tan cung cua tong
30 mu 4 mu 1 mu 9 mu 9 mu 9 + 15 mu 5 mu 1 mu 9 mu 9 mu 9
tính tổng
B= 7-7 mu 4 + 7 mu 4 -........+7 mu 301
A = 1 + 5 mũ 2 + 5 mu 4 + 5 mu 6 +.....+5 mu 200
tính
A= 1/7+1/7mu 2 + 1/7 mu 3+......+1/7mu 100
B=-4/5+4/5 mu 2 - 4/5 mu 3 + ....+4/5mu 200
tính A=25 mũ 8 + 25 mũ 4 + 25 mu 20 +......+25 mu 4 +1 / 25 mu 20 + 25 mu 28 + 25 mu 26 +.....= 25 mu 2 +1
(1 + 5 mu 2 + 5 mu 4 + 5 mu 6 + 5 mu 8)*x = 5 + 5 mu 2 + 5 mu 3 + 5 mu 4 +....+ 5 mu 10
16 MU 6 CHIA BON MU 2
17 MU 8 CHIA 9 MU 4
125 MU 4 ;25 MU 3
4MU 14 NHAN 5 MU 28
12 MU N CHIA 2 MU 2N
B1) Tinh
a) 245-4 . [15: 8 +2.(4+3 mu 2 -9)]
b) 375: 5 mu 3 -( 3 mu 8: 3 mu 6 -2 .2 mu 3)
B2: Tim x
a) 2x -2 mu 3 .3 mu 2=138
b) ( 6x- 3 mu 4) . 7 mu 3= 3 . 7 mu 4
c) 1+2+3+..............+x =500500
3 mu 3 nhan 9 tru 3 mu 4 nhan 3 cong 5 mu 8 nhan 5 mu 0 tru 5 mu 12 chia 25 mu 2
Tìm X biết :
x - 5 = 7 mu 10 :7 mu 8 + 2 mu 2018 nhan ( 2 mu 4 - 4 mu 2)
a, 5x - 10 . ( - 7 ) = 15 .( - 3 )
b, 2x + 12 = - 8
c, 3x - 5 = - 20
d, 2x - ( - 12 ) = ( - 8 ) . 23
e, x mu 2 = 49
i, ( x - 2 ) mu 2 + 1 = 65
g , 2. ( x - 3 ) mu 2 - 5 = 5 . ( - 3 ) mu 2
