5* ( 4 + 6 * X ) = 290 giải ra giúp mình
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5*(4+6*x)=290
4+6*x =290:5
4+6*x =58
6*x =58-4
6*x =54
x =54:6
x =9
Vậy x=9
a) 305 - 5x = 290
5.(61-x) = 290
61-x = 58
x = 3
b) (3x - 24) .25 = 26
3x - 24 = 2
3x = 18
x=6
c) 8 + 3.(x-5)2 = 35
3.(x-5)2 = 27
(x-5)2 = 9 = 32 = (-3)2
=> x - 5 = 3 => x = 8
x-5 = - 3 => x = 2
KL:>.
d) 21 chia hết cho x - 2
\(\Rightarrow x-2\inƯ_{\left(21\right)}=\left\{\pm1;\pm3;\pm7;\pm21\right\}.\)
..
rùi bn tự lập bảng xét giá trị nhé
a, \(5\cdot\left(4+6\cdot x\right)=290\Rightarrow4+6\cdot x=290:5\Rightarrow4+6\cdot x=58\)
\(\Rightarrow6\cdot x=58-4\Rightarrow6\cdot x=54\Rightarrow x=54:6\Rightarrow x=9\)
b, \(\left(15\cdot24-x\right):0,25=100:\frac{1}{4}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100:\frac{1}{4}\)
\(\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=100\cdot\frac{4}{1}\Rightarrow\left(15\cdot24-x\right):\frac{1}{4}=400\)
\(\Rightarrow15\cdot24-x=400\cdot\frac{1}{4}\Rightarrow15\cdot24-x=100\Rightarrow360-x=100\)
\(\Rightarrow x=360-100\Rightarrow x=260\)
= \(\frac{145,7-58+0,3}{X:8+13}=4\)
=\(\frac{87,7+0,3}{X:8+13}=4\)
= \(\frac{90}{X:8+13}=4\)
X : 8 + 13 = 90 : 4
X : 8 + 13 = 22,5
X : 8 = 22,5 - 13
X : 8 = 9,5
X = 9,5 x 8
X = 76
\(\frac{145,7-290\div5+0,3}{x\div8+13}=4\)
\(\frac{88}{x\div8+13}=4\)
\(x\div8+13=88\div4\)
\(x\div8+13=22\)
\(x\div8=22-13\)
\(x\div8=9\)
\(x=9\times8\)
\(x=72\)
\(\left(x-36\right):18=3\Leftrightarrow x-36=54\Leftrightarrow x=90\)
\(415-9\left(x+2\right)=2^2.5^2\Leftrightarrow415-9\left(x+2\right)=100\Leftrightarrow9\left(x+2\right)=315\Leftrightarrow x+2=35\Leftrightarrow x=33\)
\(5\left(4+6x\right)=290\Leftrightarrow4+6x=58\Leftrightarrow6x=54\Leftrightarrow x=9\)
Bài làm :
\(\left(x-36\right)\div18=3\)
\(\Leftrightarrow x-36=3\times18\)
\(\Leftrightarrow x-36=54\)
\(\Leftrightarrow x=54+36=90\)
\(415-9\times\left(x+2\right)=2^2\times5^2\)
\(\Leftrightarrow415-9\times x-9\times2=\left(2\times5\right)^2\)
\(\Leftrightarrow415-9\times x-18=10^2\)
\(\Leftrightarrow397-9\times x=100\)
\(\Leftrightarrow9\times x=397-100\)
\(\Leftrightarrow9\times x=297\)
\(\Leftrightarrow x=297\div9=33\).
\(5\times\left(4+6\times x\right)=290\)
\(\Leftrightarrow4+6\times x=290\div5\)
\(\Leftrightarrow4+6\times x=58\)
\(\Leftrightarrow6\times x=58-4\)
\(\Leftrightarrow6\times x=54\)
\(\Leftrightarrow x=54\div6=9\)
Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=> 245,7-58+1,3=4.(\(\frac{X}{4}+2,7\))
<=> 188=\(\frac{4X}{4}+10,8\)
<=> 188=X+10,8
X=188-10,8 =177,2
nhớ chọn D/án mk nha
5 x (4 + 6 x X) = 290
4 + 6 x X = 290 : 5
4 + 6 x X = 58
6 x X = 58 - 4
6 x X = 54
X = 54 : 6
X = 9
Vậy x = 9
tk và kb nha!
5 . ( 4 + 6x ) = 290
( 4 + 6x ) = 290 : 5
4 + 6x = 58
6x = 58 - 4
6 x = 54
x = 54 : 6
x = 9