Tìm x biết:
(x+2)/11 + (x+2)/12 + (x+2)/13 = (x+2)/14 + (x+3)/15
Những câu hỏi liên quan
tìm số hữu tỉ x , biết ; x+2/11+x+2/13+x+3/13=x+2/14+x+2/15
bạn viết sai đề bài nhé
(x+2)/11+(x+2)/12+(x+2)/13=(x+2)/14+(x+2)15
<=> (x+2)/11+(x+2)/12+(x+2)/13 - (x+2)/14 - (x+2)/15 = 0
<=> (x+2)(1/11+1/12+1/13 - 1/14 - 1/15 ) = 0
vì: (1/11+1/12+1/13 - 1/14 - 1/15 ) khác 0 nên x-2 = 0 => x=2
Đúng 0
Bình luận (0)
Bài 13: Tìm x biết: a) (x-2)(x-3)-D0. b) (x-3)(x-4)-0. c) (x-7)(6-x)=0. d) (x-3)(x-13)=0. The Bài 14: Tìm x biết: a) (12-x)(2-x)=0. b) (x-33)(11-x)=0. c) (21-x)(12-x)=0. d) (50-x)(x-150) =0. Bài 15: Tìm x biết: a) 2x +x = 45. b) 2x +7x = 918. c) 2x+3x 60+5. d) 11x+22x 33.2.
x+2/11+x+2/12+x+2/13=x+2/14+x+2/15
Tìm x
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\Rightarrow\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}-\frac{x+2}{14}-\frac{x+2}{15}=0\)
\(\Rightarrow\left(x+2\right)\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\right)=0\)
\(\Rightarrow x+2=0\left(\text{Vì }\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\ne0\right)\)
=>x=-2
Vậy x=-2
Đúng 0
Bình luận (0)
x+2/11+x+2/12+x+2/13=x+2/14+x+2/15
=>x+2/11+x+2/12+x+2/13-x+2/14-x+2/15=0
=>(x+2).(1/11+1/12+1/13-1/14-1/15)=0
mà 1/11>1/12>1/13>1/14>1/15
=>1/11+1/12+1/13-1/14-1/15 khác 0
=>x+2=0
=>x=-2
vậy x=-2
Đúng 0
Bình luận (0)
Xem thêm câu trả lời
Tìm x,biết:
| 5x-4 | =| x+2|
x+2/11 + x+2/12 + x+2/13+ x+2/14 + x+2/15
(Câu 2 x+2 là tử số 11,12,13,14,15 là phân số)
Tìm x biết:
x+2/11 + x+2/12 + x+2/13 = x+2/14 + x+2/15
\(\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}=\frac{x+2}{14}+\frac{x+2}{15}\)
\(\Leftrightarrow\frac{x+2}{11}+\frac{x+2}{12}+\frac{x+2}{13}-\frac{x+2}{14}-\frac{x+2}{15}=0\)
\(\Leftrightarrow\left(x+2\right)\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\right)=0\)
\(\Leftrightarrow x+2=0\). Do \(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}-\frac{1}{14}-\frac{1}{15}\ne0\)
\(\Leftrightarrow x=-2\)
Đúng 0
Bình luận (0)
x+2/11+x+2/12+x+2/13=x+2/14+x+2/15
(x+x+x)+(2/11+2/12+2/13)= (x+x)+(2/14+2/15)
x.3+431/858 = x.2 + 29/105
x.3-x.2=-431/858 +29/105
x.1 =-6791/30030
x= -9791/30030:1
x= -9791/30030
vậy x= -9791/ 30030
Đúng 0
Bình luận (0)
Tìm x giúp tớ nghe mọi người x+2/11 + x+2/ 12 + x+2/ 13 = x+2/ 14 + x+2/15
Thu gọn biểu thức ở 2 vế ta đc
3x+(2/11+2/12+2/13)=2x+(2/14+2/15)
x+(2/11+2/12+2/13)=2/14+2/15
x=2/14+2/15-2/11-2/12-2/13
Bạn tự tìm x nha
Đúng 0
Bình luận (0)
tìm x sao cho x+2/10^10+x+2/11^11+x+2/12^12=x+2/13^13+x+2/14^14
tìm x biết:
a,2/5:(-x-1/2)=4/5
b,x+2/11+x+2/12=x+2/13+x+2/14+x+2/15
c,x+1/9+x+2/8=x+3/7+x+4/6
Giúp mk nha,mk cần gấp lắm
Tìm x . biết :
\(a,\frac{2}{5}:\left(-x-\frac{1}{2}\right)=\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}:\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}.\frac{5}{4}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{1}{2}\)
\(\Rightarrow-x=\frac{1}{2}+\frac{1}{2}\)
\(\Rightarrow-x=1\)
\(\Rightarrow x=-1\)
Vậy \(x=-1\)
Đúng 0
Bình luận (0)
a. \(\frac{2}{5}.\left(-x-\frac{1}{2}\right)=\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}:\frac{4}{5}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{2}{5}.\frac{5}{4}\)
\(\Rightarrow-x-\frac{1}{2}=\frac{1}{2}\)
\(\Rightarrow-x=\frac{1}{2}+\frac{1}{2}\)
\(\Rightarrow-x=1\)
\(\Rightarrow x=-1\)
Tìm số hữu tỉ x biết
x+2/11 + x+2/12 + x+2/13 = x+2/14 + x+2/15
a)x+2/11+x+2/12+x+2/13=x+2/14+x+2/15
⇒x+2/11+x+2/12+x+2/13−x+2/14−x+2/15=0
⇒(x+2)(1/11+1/12+1/13−1/14−1/15)=0
⇒x+2=0.Do 1/11+1/12+1/13−1/14−1/15≠0
⇒x=−2