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a) 0.75 + 1/2 = 0.75 + 0.5 = 1.25
b) \(75\%-\frac{1}{2}=0.75-0.5=0.25\)
c) \(\frac{2}{3}+0.5:\frac{1}{3}=\frac{2}{3}+\frac{1}{2}.3=\frac{2}{3}+\frac{3}{2}=\frac{4+9}{6}\)=13/6
A) 0,75 = 3/4 + 1/2 = 5/4 HOẶC 1/2 = 0,50 + 0,75 = 1,25
B) 75 % = 3/4 - 1/2 = 1/4 HOẶC 1/2 = 50 % = 0,50 ; 75% = 0,75 = 0,75 - 0,50 = 0,25
C) 0,5 = 1/2 Nên 2/3 + 1/2 : 1/3 = 7/6 : 1/3 = 7/6 x 3/1 = 21/6
k mình nhaaa !! ^ ^
\(\frac{5,4:0,4\times1420+4,5\times780\times3}{3+6+9+12+15+18+21+24+27}\)
\(=\frac{13,5\times1420+13,5\times780}{\left(3+27\right)+\left(6+24\right)+\left(9+21\right)+\left(12+18\right)+15}\)
\(=\frac{13,5\times\left(1420+780\right)}{30+30+30+30+15}\)
\(=\frac{13,5\times2200}{135}\)
\(=\frac{29700}{135}\)
\(=220\)
\(3\frac{7}{10}=\frac{37}{10}=3.7\)
\(5\frac{63}{100}=\frac{563}{100}=5.63\)
\(12\frac{378}{1000}=\frac{6189}{500}=12.378\)
\(3\frac{7}{10}=\frac{37}{10}\)
\(5\frac{63}{1000}=\frac{5063}{1000}\)
\(12\frac{378}{1000}=\frac{6189}{500}\)
\(x\times\frac{1}{3}+x\times\frac{2}{3}=9\)
\(x\times\left(\frac{1}{3}+\frac{2}{3}\right)=9\)
\(x\times1=9\)
\(x=9\)
\(\frac{1}{3}.x+x.\frac{2}{3}=9\)
\(\Leftrightarrow x.\left(\frac{1}{3}+\frac{2}{3}\right)=9\)
\(\Leftrightarrow x.1=9\)
\(\Leftrightarrow x=9\)
1/3xD=1/(2x4)+1/(4x6)+...+1/(98x100)
2/3xD=2/(2x4)+2/(4x6)+...+1/(98x100)
2/3xD= 1/2-1/4+1/4-1/6+...+1/98-1/100
2/3xD=1/2-1/100
2/3xD=49/100
D=147/200
=9000
\(3^2.10^3\)
\(=9.1000\)
\(=9000\)