Tình nhanh
1) 35 x 1001 - 35
2 ) 140x 14 x 5 - 14 x 3
2/3 = 2 x 4/ 3 x 4 =......../.........
8/14 = 8 : 2/ 8 : 2/ 14 : 2 =........./..........
5/9 = 5 x......./ 9 x 3 =......../.........
35/ 40 = 35 : 5/ 40 : ............. =......./...........
giúp mình với trả lời mình tick cho nhé
2/3 = 2 x 4/ 3 x 4 =8/12
8/14 = 8 : 2/ 14 : 2 =4/7
5/9 = 5 x3/ 9 x 3 =15/37
35/ 40 = 35 : 5/ 40 : 5=7/8
7/3 + 1/2 + 3/70
35/9 x 14/5
3/7 x 14/5
a=302/105
b 98 /9
c6/5
k nha và học tốt
Tìm số nguyên x :
a, x=3/4+-1/12
b, x/14= 1/7+ -3/14
c,8/17+5/17<x/17<6/17+9/17
d, -6/7+3/35<x/35<-2/5+3/7
X-1009/ 1001 + x-14/ 1003 + x - 2000/ 1005 = 7
x-1009/ 1001 + x - 14/ 1003 + x - 2000/ 1005 = 7
Tính nhẩm:
7 x 5 =
7 x 6 =
7 x 2 =
7 x 4 =
35 : 7 =
42 : 7 =
14 : 7 =
28: 7 =
35 : 5 =
42 : 6 =
14 : 2 =
28 : 4 =
Học sinh nhẩm và ghi kết quả như sau:
7 x 5 = 35
7 x 6 = 42
7 x 2 = 14
7 x 4 = 28
35 : 7 =5
42 : 7 = 6
14 : 7 = 2
28: 7 =4
35 : 5 = 7
42 : 6 = 7
14 : 2 = 7
28 : 4 = 7
Tìm x, y thuộc Z biết:
1. x/4=y/3 và x+y=14
2. x-3/y-2=3/2 và x-y=14
3. x/2=y/5 và x+y=35
\(\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow\frac{x+y}{4+3}=\frac{x}{4}=\frac{y}{3}\) mà x + y = 14
\(\Rightarrow\frac{14}{7}=\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow2=\frac{x}{4}=\frac{y}{3}\)
\(\Rightarrow\hept{\begin{cases}x=2\cdot4=8\\y=2\cdot3=6\end{cases}}\)
Tìm x
a) -x/27 -1 = 2/3
b) x - 4 = -14/35 : 20/-21
c) x + 2/3 = -1/12 . -4/5
d) 1/5 - 3/5x = -15/14 :20/-21
e) -3/7x = 3/5 . 28/9
f)1/2x + 3/5x = -2/3
a: =>x/27+1=-2/3
=>x/27=-5/3
=>x=-45
b: \(\Leftrightarrow x-4=\dfrac{2}{5}:\dfrac{20}{21}=\dfrac{2}{5}\cdot\dfrac{21}{20}=\dfrac{42}{100}=\dfrac{21}{50}\)
=>x=221/50
c: \(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
=>x=1/15-2/3=1/15-10/15=-9/15=-3/5
d: \(\Leftrightarrow x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{15}{14}\cdot\dfrac{21}{20}\)
=>\(x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{3}{2}\cdot\dfrac{3}{4}=\dfrac{1}{5}-\dfrac{9}{8}=\dfrac{-37}{40}\)
=>x=-37/24
e: =>-3/7x=84/45
=>x=-196/45
f: =>11/10x=-2/3
=>x=-20/33
Tìm số nguyên x:
1.x-43=(35-x)-48
2.305-x+14=48+(x-23)
3.-(x-6+85)=(x+51)-54
4.-(35-x)-(37-x)=33-x
5.13-|x|=|-4|
6.|x|-3+6=16
7.35-|2x-1|=14
8.|3x-2|+5=9-x
9.x-(-25+7)>12-(15-14)
10.|17+(x-15)|<5
1.\(x-43=\left(35-x\right)-48\)
\(\Rightarrow x-43=35-x-48\)
\(\Rightarrow2x=35+43-48\)
\(\Rightarrow2x=30\)
\(\Rightarrow x=15\)
2.\(305-x+14=48+\left(x-23\right)\)
\(\Rightarrow305-x+14=48+x-23\)
\(\Rightarrow305+14=48+x+x-23\)
\(\Rightarrow2x+25=319\)
\(\Rightarrow2x=294\)
\(\Rightarrow x=147\)
3.\(-\left(x-6+85\right)=\left(x+51\right)-54\)
\(\Rightarrow-x+6-85=x+51-54\)
\(\Rightarrow6-85=x+x+51-54\)
\(\Rightarrow2x-3=-79\)
\(\Rightarrow2x=-76\)
\(\Rightarrow x=-38\)
4.\(-\left(35-x\right)-\left(37-x\right)=33-x\)
\(\Rightarrow-35+x-37+x=33-x\)
\(\Rightarrow2x-72=33-x\)
\(\Rightarrow3x=105\)
\(\Rightarrow x=35\)
5.\(13-\left|x\right|=\left|-4\right|\)
\(\Rightarrow13-\left|x\right|=4\)
\(\Leftrightarrow\left[{}\begin{matrix}13-x=4\\13+x=4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=9\\x=-9\end{matrix}\right.\)