12 x 3 =?
56 + 14 =?
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a: 2/3=12/x
=>12/x=2/3
hay x=18
b: =>x/12=2/3
hay x=8
c: =>1/x=1/4
hay x=4
d: =>x/125=2/5
nên x=50
a, \(\dfrac{12}{18}=\dfrac{12}{x}\Rightarrow x=18\)
b, \(\dfrac{24}{36}=\dfrac{3x}{36}\Rightarrow3x=24\Leftrightarrow x=8\)
c, \(\dfrac{14}{56}=\dfrac{14}{14x}\Rightarrow14x=56\Leftrightarrow x=4\)
d, \(\dfrac{x}{125}=\dfrac{50}{125}\Rightarrow x=50\)
12 x 56 x 2 + 6 x 14 x 4 + 3 x 30 x 8
= ( 12 x 2 ) x 56 + ( 6 x 4 ) x 14 + ( 3 x 8 ) x 30
= 24 x 56 + 24 x 14 + 24 x 30
= 24 x ( 56 + 14 + 30 )
= 24 x 100
= 2400
và.....
12 x 56 x 2 + 6 x 14 x 4 + 3 x 30 x 8
= 24 x 56 + 24 x 14 + 24 x 30
= 24 x 100
= 2400.( cách này gọn hơn chút )
Bài 1:
a: -8/12<0<-3/-4
b: -56/24<0<7/3
c: 4/25<1<15/13
=>-4/25>-15/13
Bài 2:
a: =-60/45=-4/3
b: =4/15-3/2-8/5=8/30-45/30-48/30=-85/30=-17/6
a)ta có: \(\frac{2}{3}=\frac{12}{x}\)
=>2x=3x12
=>x=(3x12):2=18
=>x=18
b)ta có\(\frac{14}{56}=\frac{1}{x}\)
=>14x=56x1
=>x=(56x1):14
=> x=4
k mik nha ^^
x + 12 = 12
x = 12 - 12
x = 0
x - 12 = 12
x = 12 + 12
x = 24
x + 14 = 56
x = 56 - 14
x = 42
Trao đổi tk
x + 12 = 12
x = 12 - 12
x = 0
x - 12 = 12
x = 12 + 12
x = 24
x + 14 = 56
x = 56 - 14
x = 42
k cho mik nhe !
\(\frac{2}{3}=\frac{2.6}{3.6}=\frac{12}{18}\)
\(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\frac{24}{36}=\frac{24:3}{36:3}=\frac{8}{12}\)
\(\frac{x}{152}=\frac{2}{5}\Rightarrow x.5=2.152\Rightarrow x.5=304\Rightarrow x=304:5=60,8\)
a)\(\frac{2}{3}=\frac{12}{x}\Rightarrow12\times3=2x\)
=>36=2x
=>x=18
b)\(\frac{14}{56}=\frac{1}{4}=\frac{1}{x}\Rightarrow4=x\)
=>x=4
c)\(\frac{24}{36}=\frac{2}{3}=\frac{x}{12}\Rightarrow12\times2=3x\)
=>24=3x
=>x=8
d)\(\frac{x}{152}=\frac{2}{5}\Rightarrow2\times152=5x\)
=>304=5x
=>x=\(\frac{304}{5}\)
\(a)\frac{2}{3}=\frac{12}{x}\)
\(\Rightarrow2\cdot x=12\cdot3\)
\(\Rightarrow2\cdot x=36\)
\(\Rightarrow x=36:2=18\)
Vậy x = 18
\(b)\frac{24}{36}=\frac{x}{12}\)
Rút gọn : \(\frac{24}{36}=\frac{24:12}{36:12}=\frac{2}{3}\)
\(\Rightarrow\frac{2}{3}=\frac{x}{12}\)
\(\Rightarrow2\cdot12=x\cdot3\)
\(\Rightarrow x=\frac{2\cdot12}{3}=8\)
Vậy x = 8
\(c)\frac{14}{56}=\frac{1}{x}\)
Rút gọn : \(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\Rightarrow\frac{1}{4}=\frac{1}{x}\)
\(\Rightarrow x=4\)
Vậy x = 4
\(d)\frac{x}{125}=\frac{2}{5}\)
\(\Rightarrow x\cdot5=2\cdot125\)
\(\Rightarrow x\cdot5=250\)
\(\Rightarrow x=250:5=50\)
Vậy x = 50
a.1872
b.3676
2 tui cũng là army yiu bts nhìu
----jung hosoek---
a) 12 x 13 + 12 x 49 + 12 x 14 +14 x 78 = 1873
b) 34 x 34 + 56 x 45 = 3676
a: =>10|x-2|=50
=>|x-2|=5
=>x-2=5 hoặc x-2=-5
=>x=7 hoặc x=-3
b: =>|3x-12|+|5x-20|=56
=>8|x-4|=56
=>|x-4|=7
=>x-4=7 hoặc x-4=-7
=>x=11 hoặc x=-3
12 x 3 = 36
56 + 14 = 70
ủng hộ mk nha