57+2x=69 tim x
\(\dfrac{7^{x+2}+7^{x+1}+7^x}{57}=\dfrac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)
tim x
\(\Leftrightarrow\dfrac{7^x.7^2+7^x.7+7^x}{57}=\dfrac{5^{2x}+5^{2x}.5+5^{2x}.5^3}{131}\)
\(\Leftrightarrow7^x\left(\dfrac{7^2+7+1}{57}\right)=5^{2x}\left(\dfrac{1+5+5^3}{131}\right)\)
\(\Leftrightarrow7^x\dfrac{57}{57}=5^{2x}\dfrac{131}{131}\Leftrightarrow7^x=5^{2x}\Leftrightarrow7^x=25^x\Leftrightarrow x=0\)
Tính nhanh :
43 x 7 + 93 x 43 + 57 x 61 + 69 x 57
giúp tui nha ! tui sẽ tick cho
\(43\times7+93\times43+57\times61+69\times57\)
\(=43\times\left(7+43\right)+57\times\left(61+69\right)\)
\(=43\times50+57\times130\)
\(=2150+7410\)
\(=9560\)
Tìm x a, -(-x+31)-39= -69+11 b, - 37-(-57-x)= -(-20)
b: \(\Leftrightarrow-37+57+x=20\)
hay x=0
Tim x biet :
7x+2 +7x+1+7 /57 = 52x +52x+1+52x+3 /131
Nhanh tay giai giup to di may than dong toan oi
tim x biet
a)20÷(2x-3)=4
b)2017-69×(11-x)=27÷23
Giai nhanh giup minh nhe!
b ) \(2017-69.\left(11-x\right)=2^7:2^3\)
\(2017-69.\left(11-x\right)=2^4\)
\(2017-69.\left(11-x\right)=16\)
\(69.\left(11-x\right)=2017-16\)
\(69.\left(11-x\right)=2001\)
\(\left(11-x\right)=2001:69\)
\(11-x=29\)
\(x=11-29\)
\(x=-18\)
Vậy \(x=-18\)
Chúc bạn học tốt !!!
a ) \(20:\left(2x-3\right)=4\)
\(\left(2x-3\right)=20:4\)
\(2x-3=5\)
\(2x=5+3\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
Vậy \(x=4\)
a) 20 : ( 2x - 3 ) = 4
( 2x - 3 ) = 20 : 4
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2
x = 4
Vậy x = 4
b) 2017 - 69 x ( 11 - x ) = 27 : 23
2017 - 69 x ( 11 - x ) = 24
2017 - 69 x ( 11 - x ) = 16
69 x ( 11 - x ) = 2017 - 16
69 x ( 11 - x ) = 2001
( 11 - x ) = 2001 : 69
11 - x = 29
x = 11 - 29
x = -18
Vậy x = -18
1Tính Nhanh
a, 12345679 x45 biết 12345679 x9 = 111111111
b, 43 x 37 + 93 x 43 + 57 x 61 + 69 x 57
a,12345679x45=12345679x9x5=111111111x5=555555555
b,43 x 37+93 x 43+57 x 61+69 x 57
=43x(37+93)+57(61+69)
=43 x 130+57 x 130
=130 x(43+57)
=130 x 100
=13000
69 x 57 = ?
28 + 11 = ?
26 + 19 =?
39 + 6 = ?
69 x 57 = 3933
28 + 11 =39
26 + 19 = 245
39 + 6 = 45
chúc bạn học giỏi !
1) Tính nhanh :
a) 8 x 17 x 125
c) 4 x 37 x 25
d) 43 x 27 + 93 x 43 + 57 x 81 + 69 x 57
e) 123456789 x 45 biết 12345679 x 9 = 111 111 111
7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000
4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700
43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710