1) x mu 15 = x mu 1
2) (2x - 15 ) mu 5 = (2x - 5 ) mu 3
(2 x - 15 ) mu 5 =(2x-15) mu 3
cho minh hoi ; / 3x -1 / + < y - 2 > mu 2 lon hon hoac =0
/ 2x - 4 / + < 3y - 3 > mu 2 = 0
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
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
[2 mu 17 + 17 mu 2 ] nhan [9 mu 15 - 3 mu 15] nhan [ 2 mu 4-4 mu 2]
a ,/ 2x - 4 / + ( 3y - 3 ) mu 2 = 0
b , / 3x - 1 / + ( y - 2 ) mu 2 > hoac = 0
giup minh voi chieu mai mk phai di hoc roi
7 nhan 6 mũ 10 nhan 2 mu 20 nhan 3 mu 6-2 mu 19 nhan 6 mu 15 phần 9 nhân 6 mu 19 nhan 2 mu 9 -4 nhan 3 mu 17 nhan 2 mu 26
So sanh :
a, 9 mu 5 va 27 mu 3
b, 3 mu 200 va 2 mu 300
c, 31 mu 11 va 17 mu 14
d, 199 mu 20 va 2003 mu 15
e, 2 mu 1993 va 7 mu 714
