Tìm x
x + 9.x + 7.x + 5.x = 2244
tìm x
x*3,4=15,3
7,5:x=0,24
5/6:=7/8
2/3*x=5/9
x*3,4=15,3
x = 15,3 : 3,4
x = 4,5
7,5:x=0,24
x = 7,5 : 0,24
x = 31,25
5/6:x=7/8
x = 5/6 : 7/8
x = 20/21
2/3*x=5/9
x = 5/9 : 2/3
x = 5/6
Xx3,4=15,3
X = 15,3 : 3,4
X =4.5
7,5:x=0,24
x=7,5 : 0,24
x= 31.25
5/6:x=7/8
x=5/6 : 7/8
x= 20/21
2/3xX=5/9
X= 5/9 : 2/3
X= 5/6
X x 3,4 = 15,3
x = 15,3 : 3,4
x = 4,5
7,5 : x = 0,24
x = 7,5 : 0,24
x = 31,25
5/6 : x = 7/8
x = 5/6 : /8
x = 20/21
2/3 x X = 5/9
x = 5/9 : 2/3
x = 5/6
1.tìm x
X x 6/7=5/14 X : 2/3=4/9
X-1/4=3/2 X+4/5=8/9
`x xx 6/7=5/14`
`=>x=5/14:6/7`
`=>x=5/14xx7/6`
`=>x=35/84`
`=>x=5/12`
Vậy `x=5/12`
__
`x:2/3=4/9`
`=>x=4/9xx2/3`
`=>x=8/27`
Vậy `x=8/27`
__
`x-1/4=3/2`
`=>x=3/2+1/4`
`=>x=6/4+1/4`
`=>x=7/4`
Vậy `x=7/4`
__
`x+4/5=8/9`
`=>x=8/9-4/5`
`=>x=40/45-36/45`
`=>x=4/45`
Vậy `x=4/45`
\(x\cdot\dfrac{6}{7}=\dfrac{5}{14}\)
\(x\) \(=\dfrac{5}{14}:\dfrac{6}{7}\)
\(x\) \(=\dfrac{5}{12}\)
\(x:\dfrac{2}{3}=\dfrac{4}{9}\)
\(x\) \(=\dfrac{4}{9}\cdot\dfrac{2}{3}\)
\(x\) \(=\dfrac{8}{27}\)
\(x-\dfrac{1}{4}=\dfrac{3}{2}\)
\(x\) \(=\dfrac{3}{2}+\dfrac{1}{4}\)
\(x\) \(=\dfrac{7}{4}\)
\(x+\dfrac{4}{5}=\dfrac{8}{9}\)
\(x\) \(=\dfrac{8}{9}-\dfrac{4}{5}\)
\(x\) \(=\dfrac{4}{45}\)
Bài 1 : Tìm X
X/-2 = -18/X
X/2 + X/5 = 17/10
Bài 2 : Tính ( tính nhanh nếu có thể )
2 mũ 5 . 9 - 2 mũ 6 / 32.5 + 25. 3 mũ 2
Bài 3 : Tìm số nguyên X biết :
5/21 + -3/7 < X/21 < -2/7 + 8/21
Giúp nhanh đang gấp ạ!!!
Bài 1:
a: x/-2=-18/x
=>x2=36
=>x=6 hoặc x=-6
b: x/2+x/5=17/10
=>7/10x=17/10
hay x=17/7
Tìm x, biết:
x+ 9x + 7x + 5x= 2244
x + 9x + 7x + 5x = 2244
<=> 1x + 9x + 7x + 5x = 2244
x ( 1 + 9 + 7 + 5 ) = 2244
22x = 2244
x = 2244 : 22
x = 1122
x + 9x + 7x + 5x = 2244
<=> 22x = 2244
<=> x = 2244 : 22
=> x = 102
2 TÌM X
X- 9 = 21:5
X = ............................
X = ............................
X : 3 = 1,248 : 4
X = ..........................
X = ............................
X- 9 = 21:5
X- 9 = 4,2
x = 4,2 + 9
x = 13,2
X : 3 = 1,248 : 4
X : 3 = 0,312
x = 0,312 x 3
x = 0,936
x - 9 = 4,2
x = 4,2 + 9 =13,2
x : 3 = 0,312
x = 0,312 x 3 = 0,936
1/3*5+1/5*7+1/7*9+....+1/x*(x+2)=16/99
tìm x
x là số tự nhiên
Giải:
\(\dfrac{1}{3.5}+\dfrac{1}{5.7}+\dfrac{1}{7.9}+...+\dfrac{1}{x.\left(x+2\right)}=\dfrac{16}{99}\)
\(\dfrac{1}{2}.\left(\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+...+\dfrac{2}{x.\left(x+2\right)}\right)=\dfrac{16}{99}\)
\(\dfrac{1}{2}.\left(\dfrac{1}{2}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{9}+...+\dfrac{1}{x}-\dfrac{1}{x+2}\right)=\dfrac{16}{99}\)
\(\dfrac{1}{2}.\left(\dfrac{1}{3}-\dfrac{1}{x+2}\right)=\dfrac{16}{99}\)
\(\dfrac{1}{3}-\dfrac{1}{x+2}=\dfrac{16}{99}:\dfrac{1}{2}\)
\(\dfrac{1}{3}-\dfrac{1}{x+2}=\dfrac{32}{99}\)
\(\dfrac{1}{x+2}=\dfrac{1}{3}-\dfrac{32}{99}\)
\(\dfrac{1}{x+2}=\dfrac{1}{99}\)
\(\Rightarrow x+2=99\)
\(x=99-2\)
\(x=97\)
Chúc em học tốt!
\(\dfrac{1}{3x5}+\dfrac{1}{5x7}+\dfrac{1}{7x9}+...+\dfrac{1}{x\left(x+2\right)}=\dfrac{16}{99}\)
\(=\dfrac{1}{2}\left(\dfrac{2}{3x5}+\dfrac{2}{5x7}+...+\dfrac{2}{x\left(x+2\right)}\right)=\dfrac{16}{99}\)
\(=\dfrac{2}{3x5}\)\(+\dfrac{2}{5x7}+...+\dfrac{2}{x\left(x+2\right)}=\dfrac{32}{99}\)
\(=\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{7}+\dfrac{1}{7}+.....+\dfrac{1}{x}-\dfrac{1}{x+2}=\dfrac{32}{99}\)
\(=\dfrac{1}{3}-\dfrac{1}{x+2}=\dfrac{32}{99}=>x=97\)
Tìm X
X+X x 3 : \(\dfrac{2}{9}\) +X :\(\dfrac{2}{7}\) =252
CÁC BN GIÚP MK NHA!MK ĐANG CẦN GẤP
\(x+x\cdot3:\dfrac{2}{9}+x:\dfrac{2}{7}=252\)
\(\Leftrightarrow x+x\cdot3\cdot\dfrac{9}{2}+x\cdot\dfrac{7}{2}=252\)
\(\Leftrightarrow x\cdot18=252\)
hay x=14
x,xx :0,2+0,5+x nhân 2 phần 5 = 9
tìm x
a. 547 + 389 + 453 + 211
b. 158 + 445 + 342 + 555
c. 24 x 3 x 5 x 10
d. 12 x 5 x 15 x 7
e. 1122 x 34 + 2244 x 83
f. 8466 x 15 + 170 x 4233
a) \(547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
b) \(158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
c) \(24.3.5.10\)
\(=\left(24.5\right).\left(10.3\right)\)
\(=120.30\)
\(=3600\)
d) \(12.5.15.7\)
\(=\left(12.5\right).\left(15.7\right)\)
\(=60.105\)
\(=6300\)
e) \(1122.34+2244.83\)
\(=1122.2.17+2244.83\)
\(=2244.17+2244.83\)
\(=2244.\left(17+83\right)\)
\(=2244.100\)
\(=224400\)
f) \(8466.15+170.4233\)
\(=8466.15+85.2.4233\)
\(=8466.15+85.8466\)
\(=8466.\left(15+85\right)\)
\(=8466.100\)
\(=846600\)
A 1600
B 1500
C 3600
D 6300
\(a,547+389+453+211\)
\(=\left(547+453\right)+\left(389+211\right)\)
\(=1000+600\)
\(=1600\)
\(b,158+445+342+555\)
\(=\left(158+342\right)+\left(445+555\right)\)
\(=500+1000\)
\(=1500\)
\(c,24\times3\times5\times10\)
\(=\left(24\times5\right)\times\left(3\times10\right)\)
\(=120\times30\)
\(=3600\)
\(d,12\times5\times15\times7\)
\(=60\times105\)
\(=6300\)
\(e,1122\times34+2244\times83\)
\(=1122\times2\times17+2244\times83\)
\(=2244\times\left(17+83\right)\)
\(=2244\times100\)
\(=224400\)
\(f,8466\times15+170\times4233\)
\(=8466\times15+85\times2\times4233\)
\(=8466\times\left(15+85\right)\)
\(=8466\times100\)
\(=846600\)
Học tốt