x+4/5=2x5/3
tính
(2^2+1) x (2^2 -1) x (2^4 - 4^2)
(7^3+7^5) x (5^4+5^6) x (3^3 x 3-9^2)
2^2x5 [( 5^2 + 2^3) : 11] - 2^4 + 2 x 10^3
(2 ^ 2 + 1) x (2 ^ 2 - 1) x (2 ^ 4 - 4 ^ 2)
= (2 ^ 2 + 1) x (2 ^ 2 - 1) x ( 16 - 16 )
= (2 ^ 2 + 1) x (2 ^ 2 - 1) x 0
= 0
( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x ( 3 ^ 3 x 3 - 9 ^ 2)
= ( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x ( 3 ^ 4 - 3 ^ 4)
= ( 7 ^ 3 + 7 ^ 5) x (5 ^ 4 + 5 ^ 6) x 0
= 0
2 ^ 2 x 5 [( 5 ^ 2 + 2 ^ 3) : 11] - 2 ^ 4 + 2 x 10 ^ 3
= 4 x 5 [( 25 + 8 ) : 11] - 8 + 2 x 1000
= 20 ( 33 : 11) - 8 + 2000
= 20 x 3 - 8 + 2000
= 60 - 8 + 2000
= 2052
a)4(15-18)-(3-5)x(-3)^2
b)(-4-11):(-3)
c)143-(-57)-(-2)^3x(-3)^0
d)(-5)x{(90-2x5)-10^2+10:|-2|}
\(a)4(15-18)-(3-5).(-3)^2\)
\(=4.\left(-3\right)-2.9\)
\(=6\)
\(b)(-4-11):(-3)\)
\(=-15:\left(-3\right)\)
\(=5\)
\(c)143-(-57)-(-2)^3.(-3)^0\)
\(=143+57+8.1\)
\(=208\)
\(d,\left(-5\right).\left[\left(90-2.5\right)-10^2+10:\left|-2\right|\right]\)
\(=-5.\left[80-100+10:2\right]\)
\(=-5.-15\)
\(=75\)
Tìm x E Z
220+(2^4+(x-5)]=8^2x5
\(\Leftrightarrow220+16+x-5=64.5=320\\ \Leftrightarrow231+x=320\\ \Leftrightarrow x=89\)
(2x+1)^3-5^4:5^2+1=2x5^2+1(^ là mũ, x thứ nhất là /íc/; x thứ hai là nhân, nhớ giải chi tiết)
5^2x-3 - 2x5^2 = 5^2 x 3
Tìm X
52x-3 - 2x52 = 52 x 3
52x-3 - 2x52 = 75
52x-3 - 50 = 75
52x-3 = 75 +50
52x-3 = 125 = 53
=> 2x - 3 = 3
=> 2x = 3+3
=> 2x = 6
=>x = 6:2
=> x = 3
tick nhé
52x-3-2.52=52.3
52x-3-2.25=25.3
52x-3-50=75
52x-3=75+50
52x-3=125=53
2x-3=3
2x=3+3
2x=6
x=6:2
x=3
Vay x = 3
3/5^2x5^2-2 1/4^3 :3/4^3 + 1/2
Trong các phép tính sau, những phép tính nào làm đúng? ( CHỌN NHIỀU ĐÁP ÁN )
A 3/4 + 1/3 = 3+1 /4 + 3 = 4/7
B 7/9 - 1/3 = 7- 1/ 9- 3 = 6/6 = 1
C 6/7 x 2/5 = 6x2 / 2x5 = 12/35
D 5/6 : 1/3 = 5/6 x 3/1 = 5/2
6 x5/3 7:8/4+1/3 2x5/8-1/2 3/7:5/6x1/4
10
\(\dfrac{23}{6}\)
\(\dfrac{3}{4}\)
\(\dfrac{9}{70}\)
6 x5/3=10 7:8/4+1/3=23/6 2x5/8-1/2=3/4 3/7:5/6x1/4=9/70