75 : 3/4 = ??? các bạn giúp mik nhé
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\(2\)x\(4\)x\(8\)x\(5\)x\(25\)x\(125\)
=(2x5)x(4x25)x(8x125)
=10x100x1000
=1000000
2x4x8x5x25x125 = ( 2 x 5 ) x ( 4 x 25 ) x ( 8 x 125 )
= 10 x 100 x 1000
= 1000000
Chúc bạn học tốt và đạt điểm cao ❤
![](https://rs.olm.vn/images/avt/0.png?1311)
= 25 x 25 + 25 x 75 = 25x (25 + 75) = 25 x 100 = 2500
![](https://rs.olm.vn/images/avt/0.png?1311)
-1+2-3+4-5+6.....-99+100
=(2+4+6+....+98+100)-(1+3+5+...+99)
=(100+2).50:2-(99+1).50:2
=102.50:2-100.50:2
=2550-2500
=50
![](https://rs.olm.vn/images/avt/0.png?1311)
5) 24*(15+49)+12*(50+42)
=24*64+12*92
=24*64+12*2*46
=24*64+24*46
=24*(64+46)
=24*110
=2640
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a)3\left(x-1\right)^2=75\)
\(\Leftrightarrow\left(x-1\right)^2=25\)
\(\Leftrightarrow\orbr{\begin{cases}\left(x-1\right)^2=\left(-5\right)^2\\\left(x-1\right)^2=5^2\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=-5\\x-1=5\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-4\\x=6\end{cases}}\)
\(b)170+\left(84-5x\right):2^2=186\)
\(\Leftrightarrow\frac{84-5x}{4}=16\)
\(\Leftrightarrow84-5x=64\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
\(c)125-5\left(x+4\right)=38\)
\(\Leftrightarrow5\left(x+4\right)=87\)
\(\Leftrightarrow x+4=\frac{87}{5}\)
\(\Leftrightarrow x=\frac{87}{5}-4\)
\(\Leftrightarrow x=\frac{67}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Đề là j, chứng minh hay tìm n để thỏa mãn ddieuf kiện j đó hả b
![](https://rs.olm.vn/images/avt/0.png?1311)
200cm3 < 2dm3
0,6dm3 = 600m3
0,002dm3 = 2m3
3004cm3 < 4dm3
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
\(x^3+x^2-4x=4\)
\(\Rightarrow x^3+x^2-4x-4=0\)
\(\Rightarrow\left(x^3+x^2\right)-\left(4x+4\right)=0\)
\(\Rightarrow x^2\left(x+1\right)-4\left(x+1\right)=0\)
\(\Rightarrow\left(x^2-4\right)\left(x+1\right)=0\)
\(\Rightarrow\left(x-2\right)\left(x+2\right)\left(x+1\right)=0\)
\(\Rightarrow x-2=0;x+2=0;x+1=0\)
\(\Rightarrow x\in\left\{2;-2;-1\right\}\)
a)\(2.\left(x+5\right)-x^2-5x=0\)
\(\Leftrightarrow2\left(x+5\right)-x\left(x+5\right)=0\)
\(\Leftrightarrow\left(x+5\right).\left(2-x\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+5=0\\2-x=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=-5\\x=2\end{cases}}\)
b)\(3x^3-48x=0\)
\(\Leftrightarrow3x\left(x^2-16\right)=0\)
\(\Leftrightarrow3x.\left(x-4\right).\left(x+4\right)=0\)
\(\Leftrightarrow\orbr{\frac{x=4}{\frac{x=0}{x=-4}}}\)
c)\(x^3+x^2-4x=4\)
\(\Leftrightarrow x^2\left(x+1\right)-4\left(x+1\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x^2-4\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(x-2\right)\left(x+2\right)\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{x=0}{x=2}\\\overline{x=-2}\end{cases}}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : \(\frac{x+5}{4}=\frac{x-4}{3}\)
\(\Rightarrow3\left(x+5\right)=4\left(x-4\right)\)
\(\Leftrightarrow3x+15=4x-16\)
\(\Leftrightarrow3x-4x=-16-15\)
\(\Leftrightarrow-x=-31\)
\(\Rightarrow x=31\)
100 ạ
Chúc anh học tốt
\(75\div\frac{3}{4}=100\)
\(@Duy\)
\(#Minhthaito\)