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`2,5 \div 1,99 + 2,5 \div 100`
`= 2,5 \times 100/199 + 2,5 \times 1/100`
`= 2,5 \times (100/199+1/100)`
`= 2,5 \times 10199/19900`
`= 10199/1990.`
`100:(x+2,5)=2,5`
`=> x+2,5=100:2,5`
`=> x+2,5=40`
`=> x=40-2,5`
`=> x=37,5`
\(36,75+89,46=126,21\)
\(351-138,9=212,1\)
\(60,38\times47,2=2849,936\)
\(109,44:6,08=18\)
\(2,36\times4,3=10,148\)
\(151,5:2,5=60,6\)
675,4 - X x 2,5 = 0,4
X x 2,5 = 675,4 - 0,4
X x 2,5 = 675
X = 675 : 2,5
X = 27
chúc bạn HT
\(419:\left(8\times8\times4,18+0,17\times2,5+2,09\times2\times36+0,23\times2,5\right)\)
\(=419:\left(64\times4,18+0,17\times2,5+4,18\times36+0,23\times2,5\right)\)
\(=419:\left[\left(64+36\right)\times4,18+\left(0,17+0,23\right)\times2,5\right]\)
\(=419:\left[100\times4,18+0,4\times2,5\right]\)
\(=419:\left[418+1\right]\)
\(=419:419\)
\(=1\)
\(=\dfrac{419}{64\cdot4.18+0,17\cdot2,5+2,09\cdot72+0,23\cdot2,5}\)
\(=\dfrac{419}{0,4\cdot2,5+64\cdot4,18+2,09\cdot72}\)
\(=\dfrac{419}{1+418}=1\)
4\(\dfrac{2}{5}\) - 2,5 \(\times\) \(x\) = 3 \(\times\) \(\dfrac{2}{9}\)
\(\dfrac{22}{5}\) - \(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{2}{3}\)
\(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{22}{5}\) - \(\dfrac{2}{3}\)
\(\dfrac{5}{2}\) \(\times\) \(x\) = \(\dfrac{56}{15}\)
\(x\) = \(\dfrac{56}{15}\): \(\dfrac{5}{2}\)
\(x\) = \(\dfrac{112}{75}\)
\(y\times9,6+y:2,5=45\\ \Rightarrow y\times\dfrac{48}{5}+y:\dfrac{5}{2}=45\\ \Rightarrow y\times\dfrac{48}{5}+y\times\dfrac{2}{5}=45\\ \Rightarrow y\times\left(\dfrac{48}{5}+\dfrac{2}{5}\right)=45\\ \Rightarrow y\times10=45\\ \Rightarrow y=45:10\\ \Rightarrow y=4,5\)
=2,5*1,99+2,5*0,01
=2,5*2
=5