450:(x-19)=50
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\(450:\left(x-19\right)=50\\ \Leftrightarrow x-19=5\\ \Leftrightarrow x=24\)
\(2\left(x-52\right)=2.23+20\\ \Leftrightarrow2\left(x-52\right)=66\\ \Leftrightarrow x-52=33\\ \Leftrightarrow x=85\)
\(10-\left(x-3\right):2=72-100\\ \Leftrightarrow10-\left(x-3\right):2=-28\\ \Leftrightarrow10-\left(x-3\right)=-56\\ \Leftrightarrow x-3=66\\ \Leftrightarrow x=69\)
1.x-19=450:50
x-19=9
x =9+19
x =28
2. 2(x-51)=46+20
2(x-51)=66
x-51=66:2
x-51=33
x =33+51
x =84
a/\(450:\left(x-19\right)=50\)
=>\(x-19=9\)
=>\(x=28\)
Vậy...
b/\(3^2.\left(x+4\right)-5^2=5x.2^2\)
\(9\left(x+4\right)=20x+25\)
\(20x+25=9x-36\)
\(11x=-61\)
\(x=-\dfrac{61}{11}\)
Vậy..
c/Tương tự
d/Tương tự
Tìm x, biết:
a) 198 - ( x + 4 ) = 120
(x+4) = 198-120
x+ 4 =78
x= 78 - 4
x= 74
b) 2(x-51) = 2.23 + 20
2(x-51)=36
x-51 = 36:2
x-51=18
x=18+51
x=69
c) 450 : ( x - 19 ) = 50
x-19= 450:50
x-19=9
x=9+19
x=28
d)4(x-3) = 72 - 110
4(x-3) =48
x-3 = 48:4
x-3=12
x=12+3
x=15
a) 198 - ( x + 4 ) = 120
=>x+4=78
=>x=744
b) 2(x-51) = 2.23 + 20
=>
x + 50 = 450 - 50
x + 50 = 400
x = 400 - 50
x = 350 ai k mk,mk k lại
a) 17 + x=13
=> x=17-13
=> x=4
b) x-25=-18
=>x=-18+25
=>x=7
c) -32-x=-36
=>x=36-32
=> x=4
d) x+78=-56
=> x=-56-78
x=-134
a) \(17+x=13\)
\(\Rightarrow x=13-17\)
\(\Rightarrow x=-4\)
Vậy x = -4
b) \(x-25=-18\)
\(\Rightarrow x=-18+25\)
\(\Rightarrow x=7\) _ Vậy x = 7
c) \(-32-x=-36\)
\(\Rightarrow x=-32-\left(-36\right)\)
\(\Rightarrow x=4\)_Vậy x = 4
d) \(x+78=-56\)
\(\Rightarrow x=-56-78\)
\(\Rightarrow x=-134\)
Vậy x = -134
a) 450 – ( 25 – 10) = 450 – 15
= 435
450 – 25 – 10 = 425 – 10
= 415
b) 180 : 6 : 2 = 30 : 6
= 15
180 : ( 6 : 2 ) = 180 : 3
= 60
c) 410 – (50 +30) = 410 -80
= 330
410 - 50 + 30 = 360 + 30
= 390
d) 16 x (6 : 3) = 16 x 2
= 32
16 x 6 : 3 = 96 : 3
= 32
bai nay de thui
nhung bay gio mk phai di hoc rui
luc nao ve mk lam cho
k mk nha
\(\frac{450}{2^X-19}=180\)
\(2^X-19=\frac{450}{180}\)
\(2^X-19=2,5\)
\(2^X=19+2,5\)
\(2^X=21,5\)
450:(x-19)=50
=> x-19=450:50
=> x-19=9
=> x=9+19
Vậy x=28.
450:(x-19)=50
x-19=450:50
x-19=9
x=19+9
x=28