\(xemlai..7x-x...hay...7x^2-x\)
7x-x=6x
\(6x=\frac{5^{21}}{5^{19}}+3.2^2.7^0=5^{\left(21-19\right)}+3.4.1=5^2+12=37\)
6x=37=> x=37/6
\(xemlai..7x-x...hay...7x^2-x\)
7x-x=6x
\(6x=\frac{5^{21}}{5^{19}}+3.2^2.7^0=5^{\left(21-19\right)}+3.4.1=5^2+12=37\)
6x=37=> x=37/6
7x - x = 521: 519 + 3.22 - 7
7x - x = 521 : 519 + 3.22 - 7 0
a) 5x + 3x = 36 : 33.4 + 12
4x + 2x = 68 – 219 : 216
a) 5x + x = 39 – 311:39
b) 7x – x = 521 : 519 + 3.22 - 70
c) 7x – 2x = 617: 615 + 44 : 11
a) 5x + 3x = 36 : 33.4 + 12
4x + 2x = 68 – 219 : 216
a) 5x + x = 39 – 311:39
b) 7x – x = 521 : 519 + 3.22 - 70
c) 7x – 2x = 617: 615 + 44 : 11
[83+519]x=66*100+22
Tìm x ∈ Z, biết:
a) - 5 19 + 3 19 < x 19 ≤ 13 19 + - 11 19
1)Tim số tự nhiên x, biết :
a)x:13=41. b)1428:x=14. c)4x:17=0
d)7x-8=713. e)8(x-3)=0. g)0:x=0
2)tinh nhanh :
a)519-(378-81). b)5311-996. c) (814+328)-128
d)312.28-18.312. e)6084-3995
Tìm x, biết
a) 3 , 2 x − 4 5 + 2 3 : 3 2 3 = 7 20
b) 3 5 x − 2 3 x − x . 1 7 = − 5 21
Bài 2: (1.5 điểm) Tìm x, biết: (83 + 519).x = 66.100 + 22. Kết quả:
Tìm x thuộc Z, biết:
a) 5 3 + − 14 3 < x < 8 5 + 4 10
b) 5 21 + − 3 7 < x 21 < − 2 7 + 8 21