\(\Leftrightarrow2^{x+1}=8\)
=>x+1=3
hay x=2
tìm y biết : y : 6 x 7.2 +1.3 x y + y : 2 + 15 = 19.95
5/8*x-1.3*x-1/6*x=15
Tính giá trị biểu thức :
C = 1và 13/15 nhân (0.5)^2 nhân ( -3) +(8/15-25%) chia 1và23/24
Tìm x(2/1.3+2/3.5+2/5.7+...+2/97.99) - x = -100/99
Lưu ý: Dấu .(chấm)
B = 3/2 + 3/6 + 3/12 + 3/15 +............... + 3/(n-1)n
C = 2/1.3 + 2/3.5 + 2/7.9 + ...................... + 2/30.32
D = 1/1.3 + 1/3.5 + ............. + 1/ ( n+1 )( n+3 )
A.(15/10x+25):2/3=60
B.5/2-x=1
C.x-0.3x=1.3
D.3/4x-2/3x=-5/12
a, S1 = 102+122+142+.......+1002
b , S2 = 52+102+152+.......+1002
c, S3= 112+132+152+.......+392
d, S4= 1.3+3.5+5.7+........+97.99
tìm x
5x -x =4088 + (5 ^7 + 5^9 ) . (6 ^8 + 6^10 ) . (2^4-4^2)
3 ^2 . ( 15 - 2x )- 5 ^2 = 5 . 2 ^2
152 - ( 2x-1)^3 = 3^0.3^1.3^2
AI NHANH MÌNH TICK NHA
tim x biet
a)\(\frac{3}{4}.\frac{8}{9}.\frac{15}{16}...\frac{2499}{2500}\)
b) \(\frac{2^2}{1.3}.\frac{3^2}{2.4}.\frac{4^2}{3.5}...\frac{50^2}{49.51}\)
bài 1: tìm x
a: 2,78 .x - 0,126 =3.12,19
b:5/12.(8 +x)- 1/5 .(15/4 + x) =15
c:x.20 2 + 2 + 2 + 2 + 2
______ = ________________________________
11 1.3 + 3.5 + 5.7 + 7.9 +9.21
