(1/4+35%+0,65%+75%)chia(8/5-24,35%)
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[\(\dfrac{1}{4}\) + 35% + 0,65% + 75% ]: [ 1\(\dfrac{6}{4}\) + 4\(\dfrac{8}{24}\)]
= [25% + 35% + 0,65% + 75%] : [ \(\dfrac{10}{4}\) + \(\dfrac{104}{24}\)]
= [ (25% +75%) + (35% +0,65%)]:(\(\dfrac{60}{24}\) + \(\dfrac{104}{24}\))
= [ 100% + 35,65%]: \(\dfrac{41}{6}\)
= 135,65% : \(\dfrac{41}{6}\)
= \(\dfrac{13565}{10000}\) : \(\dfrac{41}{6}\)
= \(\dfrac{13565}{10000}\) \(\times\) \(\dfrac{6}{41}\)
= \(\dfrac{8139}{41000}\)
\(\left(\dfrac{1}{4}+35\%+0,65+75\%\right)\times\left(1\dfrac{6}{9}+4\dfrac{8}{24}\right)\)
\(=\left(0,25+0,35+0,65+0,75\right)\times\left(1+\dfrac{2}{3}+4+\dfrac{1}{3}\right)\)
\(=2\times6\)
\(=12\)
\(\left(\dfrac{1}{4}+35\%+0,65+75\%\right)\times\left(1\dfrac{6}{9}+4\dfrac{8}{24}\right)\)
\(=\left(\dfrac{1}{4}+\dfrac{7}{20}+\dfrac{65}{100}+\dfrac{3}{4}\right)\times\left(\dfrac{15}{9}+\dfrac{13}{3}\right)\)
\(=\left(\dfrac{5}{20}+\dfrac{7}{20}+\dfrac{13}{20}+\dfrac{15}{20}\right)\times6\)
\(=\left[\left(\dfrac{15}{20}+\dfrac{5}{20}\right)+\left(\dfrac{7}{20}+\dfrac{13}{20}\right)\right]\times6\)
\(=2\times6\)
\(=12\)
<=> (0,75+0,65+0,25+0,35)(0,25.2+0,25.3+0,25.5=2(0,25.10)=2.2,5=5
Đs: 5
[1.4+0.6]*[2.8+0.75+1.25]
2 * 4.8 =9.6
minh chac chan lun do minh tinh may tinh lai rui
(75% + 0,65 + 1/4 + 35% ) x ( 5/4 + 125 x 3 + 12 x 0,625 )
=( \(\frac{3}{4}+0,65+\frac{1}{4}+3,5\) ) x ( \(\frac{5}{4}+125\)x 3 + 7,5 )
= ( 1 + 4,15 ) x ( \(\frac{5}{4}\) + 375 + 7,5 )
= 5,15 x 383,75
= 1976,3125
= ( 25% + 35% + 65% + 75% ) x ( 1 + 2/3 + 4 + 1/3 )
= ( ( 25% + 75% ) + ( 35% + 65% ) ) x 6
= 2 x 6 = 12
\(\left(\frac{1}{4}+35\%+0,65+75\%\right)\)\(x\left(1\frac{6}{9}+4\frac{8}{24}\right)\)
\(=\left(\frac{1}{4}+\frac{7}{20}+\frac{65}{100}+\frac{3}{4}\right)\)\(x\left(\frac{15}{9}+\frac{13}{3}\right)\)
\(=\left(\frac{5}{20}+\frac{7}{20}+\frac{13}{20}+\frac{15}{20}\right)\)\(x6\)
\(=2x6\)
\(=12\)
\(\left(\frac{1}{4}+35\%+0,65+75\%\right)x\)\(\left(1\frac{6}{3}+4\frac{8}{24}\right)\)
\(=\left(\frac{1}{4}+\frac{7}{20}+\frac{13}{20}+\frac{3}{4}\right)\)\(x\left(3+\frac{13}{3}\right)\)
\(=\left(\frac{5}{20}+\frac{7}{20}+\frac{13}{20}+\frac{15}{20}\right)\)\(x7\)
\(=2x7\)
\(=14\)
a) \(S=1^5+3^5+....+75^5+99^5\)
\(\left(2a+1\right)^5-\left(2a+1\right)=2a\left(2a+1\right)\left(2a+2\right)\left[\left(2a+1\right)^2+1\right]\)
\(\left(2a+1\right)^5-\left(2a+1\right)=4a\left(2a+1\right)\left(a+1\right)\left[\left(2a+1\right)^2+1\right]⋮4\)
\(S=\left(1^5-1\right)+\left(3^5-3\right)+....+\left(75^5-75\right)+\left(99^5-99\right)+\left(1+3+5+...+75+99\right)\)
\(\Leftrightarrow\begin{matrix}1^5-1⋮4\\3^5-3⋮4\\5^5-5⋮4\\...........\\75^5-5⋮4\\99^5-99⋮4\end{matrix}\)
\(S_1=1+3+5+7+...+75+99=\frac{\left(1+75\right)\left[\frac{75-1}{2}+1\right]}{2}+99=38.38+96+3\)
\(\Rightarrow S_1:4\) dư 3
\(\Leftrightarrow S\) chia 4 dư 3
a) =(1/4+7/20+13/20+3/4):(15/9+104/24)=1/3 b) =4000001,001
(x+0,2)+(x+0.7)+...+(x+4,7)=65,5
có số x là:(4,7-0,2):0,5+1=10(số)
=> x.10+(0,2+0,7+...+4,7)=65,5
=>x.10+24,5=65,5
=>x.10=65,5-24,5
=>x.10=41
=>x =41:10
x=4,1
vậy x=1 tí nữa mik làm tiếp cho
(x+0,2)+(x+0.7)+...+(x+4,7)=65,5
có số x là:(4,7-0,2):0,5+1=10(số)
=> x.10+(0,2+0,7+...+4,7)=65,5
=>x.10+24,5=65,5
=>x.10=65,5-24,5
=>x.10=41
=>x =41:10
x=4,1
vậy x=1