1.tính

5871:[928-(247-82.5)]

2,tìm x bít 

a)128-3.(x+4)=22

b)(12x-4mu3).8mu3=4.8mu4

tim x thuoc N:

a) 2 mu x =4 nhan 128

b)2 mu x nhan 3 mu x =4 nhan 9

1.tim x thuoc n biet:

a)3 mu x .3             b)x mu 20 = x         c)2 mu x.16 mu 2=1024        d)64.4 mu x=16 mu 8

2.tim n thuoc n sao:

a)3 mu 2.3 mu n=3 mu 5              b)(2 mu 2:4).2mu n=4         c)32<2 mu n<128         d)2.16>_2 mu n>4

ai giai dung va nhanh minh tick cho

tim so hang thu 50 cua cac day so sau

a,1.6,2.7,3.8,.....

b,3,8,15,24,35,........

c,1.4;4.7;7.10;.....

d3+1 mu 3;3+2mu3;3+3mu3;3+4mu3;.......

tìm n thuộc N sao cho 16 mu x < 128 mũ 4

4mu x.4mu3=256 tìm x

( x - 1 ) mu 2 : 5 mu 21 = 25 mu 30 . 5        

2.3 mu x + 1 = 10.3 mu 12 + 8 : 27 mu 4   

( 19x + 2 .5 mu 2) : 14 = ( 13 - 8 ) mu 2 

1351 - 2 . ( x + 3) = 4 mu 12 : 8 mu 7 + 3

mong m.n giup mk vs !!!!

Tìm X biết :

x - 5 = 7 mu 10 :7 mu 8 + 2 mu 2018  nhan ( 2 mu 4 - 4 mu 2)

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