11x + (15-x)=5
11x + (15-x)=5 giúp mình đi mai thi r
11x+(15-x)=5
phá ngoặc ta có:
11x+15-x=5
(11-1)x=5-15
10x=-10
x=-10:10
x=-1
11x+(15-x)=5
11x+15-x =5
11x-x =5-15
10x =-10
x =-10:10
x =-1
x+2/3=9/11
x-3/10=4/15
x ×1/7 =5/6
x÷3/5=1/6
\(x+\dfrac{2}{3}=\dfrac{9}{11}\Rightarrow x=\dfrac{9}{11}-\dfrac{2}{3}=\dfrac{5}{33}\\ x-\dfrac{3}{10}=\dfrac{4}{15}\Rightarrow x=\dfrac{4}{15}+\dfrac{3}{10}=\dfrac{17}{30}\\ x\times\dfrac{1}{7}=\dfrac{5}{6}\Rightarrow x=\dfrac{5}{6}:\dfrac{1}{7}=\dfrac{35}{6}\\ x:\dfrac{3}{5}=\dfrac{1}{6}\Rightarrow x=\dfrac{1}{6}\times\dfrac{3}{5}=\dfrac{1}{10}\)
tính hợp lý :240÷(5^3-5^3÷5^2)- 3^6÷3^4 +15 x 11x(13 - 9 )
\(240:\left(5^3-5^3:5^2\right)-3^6:3^4+15\cdot11\cdot\left(13-9\right)\)
\(=240:\left(5^3-5\right)-3^{6-4}+15\cdot11\cdot4\)
\(=240\cdot\left(125-5\right)-3^2+60\cdot11\)
\(=240:120-9+60\cdot\left(10+1\right)\)
\(=2-9+600+60\)
\(=653\)
tìm x
l 5/6x +7/15 l + 3/11x = 9
Ta có: \(\left|\frac{5}{6}x+\frac{7}{15}\right|=9-\frac{3}{11}x\)
\(\Rightarrow\orbr{\begin{cases}\frac{5}{6}x+\frac{7}{15}=9-\frac{3}{11}x\\\frac{5}{6}x+\frac{7}{15}=\frac{3}{11}x-9\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}\frac{73}{66}x=\frac{128}{15}\Rightarrow x=\frac{2816}{365}\\\frac{37}{66}x=-\frac{142}{15}\Rightarrow x=\frac{-3124}{185}\end{cases}}\)
Vậy x có 2 giá trị như trên
Tìm các số nguyên x, biết:
a) (2x - 5) + 17 = 6
b) (-18) . x = -36
c) 15 - (-11x - 7) = -22
a, (2\(x\) -5) + 17 = 6
2\(x\) - 5 = 6 - 17
2\(x\) - 5 = - 11
2\(x\) = - 11 + 5
2\(x\) = -6
\(x\) = -3
b, (-18).\(x\) = - 36
\(x\) = -36 : (-18)
\(x\) = 2
c, 15 - (-11\(x\) - 7) = -22
- 11\(x\) - 7 = 15 + 22
-11\(x\) - 7 = 37
11\(x\) = -37 - 7
11\(x\) = - 44
\(x\) = - 4
a) \(\left(2x-5\right)+17=6\Rightarrow2x-5=-11\Rightarrow2x=-6\Rightarrow x=-3\)
b) \(\left(-18\right)x=-36\Rightarrow x=\left(-36\right):\left(-18\right)=2\)
c) \(15-\left(-11x-7\right)=-22\)
\(\Rightarrow15+11x+7=-22\)
\(\Rightarrow11x=-22-7-15\)
\(\Rightarrow11x=-44\)
\(\Rightarrow x=-44:11=-4\)
a) (2x - 5) + 17 = 6
(2x - 5) = 6 - 17
2x - 5 = -11
2x = -11 + 5
2x = -6
x = -6 : 2
x = -3 Vậy x = -3
b) (-18) . x = -36
x = -36 : (-18)
x = 2 Vậy x = 2
c) 15 - (-11x - 7) = -22
(-11x - 7) = 15 - (-22)
(-11x - 7) = 37
-11x - 7 = 37
-11x = 37 + 7
-11x = 44
x = 44 : (-11)
x = -4 Vậy x = -4
❤Nhớ k cho mk nha
#Chúc bạn học tốt❤
1)-7.(5-x)-2.(x-10)=15
2)3.(x-4)-(8-x)=12
3)7.(x-9)-5.(6-x)=(-6)+11x
làm đi cho tick PLEASE!!!!!!!!!!
1.
$-7(5-x)-2(x-10)=15$
$-35+7x-2x+20=15$
$5x-15=15$
$5x=30$
$x=30:5=6$
2.
$3(x-4)-(8-x)=12$
$3x-12-8+x=12$
$4x-20=12$
$4x=12+20=32$
$x=32:4=8$
3.
$7(x-9)-5(6-x)=(-6)+11x$
$7x-63-30+5x=11x-6$
$12x-93=11x-6$
$12x-11x=93-6$
$x=87$
-5(2-x)+4(x-3) =10x + 15 (tìm x)
7(x-9)-5(6-x)=-6+11x
xy+14+2y+7x=-10 (tìm xy)
\(-5.\left(2-x\right)+4\left(x-3\right)=10x+15\)
\(-10+5x+4x-12=10x+15\)
\(9x-22=10x+15\)
\(10x-9x=-22-15\)
\(x=-37\)
\(7.\left(x-9\right)-5\left(6-x\right)=-6+11x\)
\(7x-63-30+5x=-6+11x\)
\(12x-93=-6+11x\)
\(12x-11x=-6+93\)
\(x=87\)
\(xy+14+2y+7x=-10\)
\(\left(xy+2y\right)+\left(14+7x\right)=-10\)
\(y\left(x+2\right)+7\left(2+x\right)=-10\)
\(\left(x+2\right)\left(y+7\right)=-10\)
Câu cuối mk chỉ biết làm đến đó thôi
bn tự làm nha
Bài:Chia 1 biến đã sắp xếp 1)(2x^3+11x^2+18x-3):(2x+3) 2)(2x^3+11x^2+18x-3):(3x+3) 3)(2x^3+9x^2+5x+41):(2x^2-x+9) 4)(13x+41x^2+35x^3-14):(5x-2) 5)(5x^2-3x^3+15-9x):(5-3x) 6)(-4x^2+x^3-20+5x):(x-4)
1: \(\dfrac{2x^3+11x^2+18x-3}{2x+3}\)
\(=\dfrac{2x^3+3x^2+8x^2+12x+6x+9-12}{2x+3}\)
\(=x^2+4x+3-\dfrac{12}{2x+3}\)
tìm x biết
6*x+9=15
43+2x=49
x:2+5=11
77-11x=0
12-4:x=8
x:3+8=11
mn giúp mik nhaa .mik cảm ơn nha
\(6\cdot x+9=15\)
\(\Rightarrow6\cdot x=15-9\)
\(\Rightarrow6\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{6}=1\)
_______________
\(43+2x=49\)
\(\Rightarrow2x=49-43\)
\(\Rightarrow2x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
____________
\(x:2+5=11\)
\(\Rightarrow x:2=11-5\)
\(\Rightarrow x:2=6\)
\(\Rightarrow x=6\cdot2=12\)
______________
\(77-11x=0\)
\(\Rightarrow11x=77\)
\(\Rightarrow x=\dfrac{77}{11}\)
\(\Rightarrow x=7\)
_______________
\(12-4:x=8\)
\(\Rightarrow4:x=12-8\)
\(\Rightarrow4:x=4\)
\(\Rightarrow x=\dfrac{4}{4}=1\)
_____________
\(x:3+8=11\)
\(\Rightarrow x:3=11-8\)
\(\Rightarrow x:3=3\)
\(\Rightarrow x=3\cdot3=9\)
a: 6x+9=15
=>6x=6
=>x=1
b: 2x+43=49
=>2x=6
=>x=3
c: x:2+5=11
=>x:2=6
=>x=12
d: 77-11x=0
=>7-x=0
=>x=7
e: 12-4:x=8
=>4:x=4
=>x=1
f: x:3+8=11
=>x:3=3
=>x=9