Tính nhanh:
3,75 x 0,25 + 3,75 x 0,5 + 3,75 x 0,25
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a) \(210:x=2,1:0,25=8,4\)
\(x=210:8,4=25\)
b) \(x.2+x.0,5=6,25\)
\(2,5x=6,25\)
\(x=6,25:2,5=2,5\)
c) \(x:0,25-x=15,6\)
\(3x=15,6\)
\(x=5,2\)
d) \(x:12,5=3,75.4=15\)
\(x=15.12,5=187,5\)
e) \(x.12,6-x.5,6=42\)
\(7x=42\)
\(x=6\)
g) \(x:0,1-x:4-x.0,75=2,25\)
\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)
\(9x=2,25\)
\(x=0,25\)
3.75 : \(\dfrac{1}{4}\) + 3.75 : 0.5 + 3,75 + \(\dfrac{1}{8}\) + 3,75 x 86
= 3,75 : \(\left(\dfrac{1}{4}+0.5+\dfrac{1}{8}\right)\) + 3,75 x 86
= 3,75 : \(\dfrac{7}{8}\) + 322.5
= 4,3 + 322.5 = 326,8
tích hộ chị nha
\(x\div0,5+x\div0,25+x\div0,125=3,75\)
\(\Leftrightarrow2x+4x+8x=3,75\)
\(\Leftrightarrow x\left(2+4+8\right)=3,75\)
\(\Leftrightarrow14x=3,75\)
\(\Leftrightarrow x=\frac{3,75}{14}\)
\(\Leftrightarrow x=0,2678571\)
\(\text{Vậy }x=0,2678571\)
3,75:0,5+3,75.7-3,75
=3,75x2+3,75x7-3,75x1
=3,75x(2+7-1)
=3,75x8
=30
3,75:0,5+3,75*7-3,75
=3,75*2+3,75*7-3,75*1
=3,75*(2+7-1)
=3,75*8
=30
tick nha
Nhận thấy \(3,75-2,5\times1,5=3,75-3,75=0\)
NÊN A =\(\left(1995;0,25+1996;4\right)\times2010\times2011\times0\)
Vậy A = \(0\)
A= (1995 : 0,25 + 1996 : 4) . 2010 . 2011 . (3,75 - 2,5 . 1,5)
A=(1995 : 0,25 = 1996 : 4) . 2010 . 2011 . (3,75 - 3,75)
A=(1995 : 0,25 = 1996 : 4) . 2010 . 2011 . 0
A= 0
\(A=\left(\frac{1995}{0,25}+\frac{1996}{4}\right)\cdot2010\cdot2011\cdot\left(3,75-2,5\cdot1,5\right)\)
\(A=\left(\frac{1995}{0,25}+\frac{1996}{4}\right)\cdot2010\cdot2011\cdot\left(3,75-3,75\right)\)
\(A=\left(\frac{1995}{0,25}+\frac{1996}{4}\right)\cdot2010\cdot2011\cdot0\)
\(A=0\)
P/s: cái này là toán mà lại ghi là tiếng Việt kìa, xem lại đi
a=(1995:0,25+1996×4)×2010×2011×(3,75-3,75)
a=(1995:0,25+1996×4)×2010×2011×0
a=0
a: =472x2+472x5+472x2
=472x9=4248
b: =3,6x8+7,2x4+7,2x2
=7,2(4+4+2)
=72
d: =2,4(6,2+1,9x2)=24
a: =472x2+472x5+472x2
=472x9=4248
b: =3,6x8+7,2x4+7,2x2
=7,2(4+4+2)
=72
d: =2,4(6,2+1,9x2)=24
\(\left(84,6-2\cdot x\right):3,02=5,1\)
\(\Rightarrow84,6-2\cdot x=15,402\)
\(\Rightarrow2\cdot x=69,198\)
\(\Rightarrow x=69,198:2\)
\(\Rightarrow x=34,599\)
_____________
\(\left(15\cdot24-x\right):0,25=100:0,25\)
\(\Rightarrow\left(360-x\right):0,25=400\)
\(\Rightarrow360-x=100\)
\(\Rightarrow x-360-100\)
\(\Rightarrow x=260\)
______________
\(128\cdot x-12\cdot x-16\cdot x=5200\)
\(\Rightarrow x\cdot\left(128-12-16\right)=5200\)
\(\Rightarrow x\cdot100=5200\)
\(\Rightarrow x=5200:100\)
\(\Rightarrow x=52\)
__________________
\(5\cdot x+3,75\cdot x+1,25\cdot x=20\)
\(\Rightarrow x\cdot\left(5+3,75+1,25\right)=20\)
\(\Rightarrow10\cdot x=20\)
\(\Rightarrow x=20:10\)
\(\Rightarrow x=2\)
\(x\cdot3,7+x\cdot6,3=360:120\)
\(\Rightarrow x\cdot\left(3,7+6,3\right)=3\)
\(\Rightarrow x\cdot10=3\)
\(\Rightarrow x=\dfrac{3}{10}\)
__________________
\(x\cdot23-6\cdot23+x\cdot69=320\)
\(\Rightarrow x\cdot\left(23+69\right)=320+6\cdot23\)
\(\Rightarrow x\cdot92=458\)
\(\Rightarrow x=458:92\)
\(\Rightarrow x=\dfrac{229}{46}\)
___________________
\(\left(x+1\right)\left(x+2\right)=72\)
\(\Rightarrow x^2+2x+x+2=72\)
\(\Rightarrow x^2+3x+2=72\)
\(\Rightarrow x^2+3x+2-72=0\)
\(\Rightarrow x^2+3x-70=0\)
\(\Rightarrow x^2+10x-7x-70=0\)
\(\Rightarrow\left(x-7\right)\left(x+10\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-10\end{matrix}\right.\)
___________________
\(\left(x+2\right)\cdot16\cdot x=160x\)
\(\Rightarrow16x^2+32x=160x\)
\(\Rightarrow16x^2+32x-160x=0\)
\(\Rightarrow16x^2-128x=0\)
\(\Rightarrow16x\left(x-8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
=3,75(0,25+0,5+0,25)
=3,75x1
=3,75
3,75 x 0,25 + 3,75 x 0,5 + 3,75 x 0,25
= 3,75 x (0,25 + 0,5 + 0,25)
= 3,75 x 1
= 3,75