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a, 56 x 12 + 24 x 36 + 24 x36 = 56 x 12 + 12 x 2 x 36 + 12 x 2 x 36
= 56 x 12 + 12 x 72 + 12 x 72
= 12 x ( 56 + 72 + 72 )
= 12 x 200
= 2400
b, 2005 x 178 - 77 x 2005 - 2005 = 2005 x ( 178 - 77 - 1 )
= 2005 x 100
= 200500
**** mình nha nguyễn thùy trang
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, \(\dfrac{x}{125}=\dfrac{50}{125}\Rightarrow x=50\)
=9/4x2/3+16/9x4/3
=18/12+64/36
=54/36+64/36=118/36=59/18
\(\frac{2}{3}=\frac{2.6}{3.6}=\frac{12}{18}\)
\(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)
\(\frac{24}{36}=\frac{24:3}{36:3}=\frac{8}{12}\)
\(\frac{x}{152}=\frac{2}{5}\Rightarrow x.5=2.152\Rightarrow x.5=304\Rightarrow x=304:5=60,8\)
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
\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)
\(=1235\text{×}6789\text{×}\left(630-630\right)\)
\(=1235\text{×}6789\text{×}0=0\)
\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)
\(=167\text{×}67+167\text{×}33\)
\(=167\text{×}\left(67+33\right)\)
\(=167\text{×}100=16700\)
\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)
\(=72+72+72+72+24+168\)
\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)
a)\(\dfrac{24}{36}\)=\(\dfrac{8}{12}\)
b)\(\dfrac{14}{56}\)=\(\dfrac{1}{4}\)
c)\(\dfrac{9}{24}\)=\(\dfrac{21}{56}\)
Chúc bạn học tốt!
12 x24 x36=10368
tk mk nha
=10368