x : 5/4 - X x 2/5 = 16/5
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X - 6/5 = 4
X = 4 + 6/5
X= 26/5
X x 4/5 = 23/20
X = 23/20 : 4/5
X = 23/16
8 x 2 = 16 8 x 4 = 32 8 x 7 = 56 8 x 5 = 40
16 : 8 = 2 32 : 8 = 4 56 : 8 = 7 40 : 8 = 5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
8 x 2 = 16 8 x 4 =32 8 x 7 =56 . 8 x 5 =40
16 : 8 = 2 32 : 8 =4 56 : 8 =7 40 : 8 =5
16 : 2 = 8 32 : 4 = 8 56 : 7 = 8 40 : 5 = 8
cái bài này bạn thuộc phép nhân chia của nó là làm dễ lắm nha
\(X+\dfrac{4}{5}\) x \(\dfrac{15}{16}=\dfrac{5}{2}\)
\(X+\dfrac{3}{4}=\dfrac{5}{2}\)
\(X=\dfrac{5}{2}-\dfrac{3}{4}\)
\(X=\dfrac{7}{4}\)
`x+4/5×15/16=5/2`
`qquad x+3/4=5/2`
`qquad x=5/2-3/4`
`qquad x=7/4`
Vậy `x=7/4`
a, \(\left(\frac{4}{9}.\frac{3}{7}\right).\frac{7}{4}=\frac{4}{9}\left(\frac{3}{7}.\frac{7}{4}\right)=\frac{4}{9}.\frac{3}{4}=\frac{3}{9}=\frac{1}{3}\)
b, \(\left(\frac{6}{5}.\frac{4}{5}\right).\frac{25}{16}=\frac{6}{5}\left(\frac{4}{5}.\frac{25}{16}\right)=\frac{6}{5}.\frac{5}{4}=\frac{6}{4}=\frac{3}{2}\)
c, \(\left(\frac{7}{8}.\frac{16}{9}\right).\frac{3}{14}=\frac{7}{8}\left(\frac{16}{9}.\frac{3}{14}\right)=\frac{7}{8}.\frac{8}{21}=\frac{7}{21}=\frac{1}{3}\)
a, (49.37).74=49(37.74)=49.34=39=13(49.37).74=49(37.74)=49.34=39=13
b, (65.45).2516=65(45.2516)=65.54=64=32(65.45).2516=65(45.2516)=65.54=64=32
c, (78.169).314=78(169.314)=78.821=721=13(78.169).314=78(169.314)=78.821=721=13
Nếu đúng thì k cho mình nhé bạn!( 4/9 x 3/7 ) x 7/4 = 4/9 x ( 3/7 x 7/4 ) =4/9 x 21/28 = 84/252
( 6/5 x 4/5 ) x 25/16 = ( 25/16 x 4/5 ) x 6/5 = 100/80 x 6/5 = 600/400
1) <=> 8x-16-21-7x=-4
<=> x-37=-4
<=> x=33
2) <=> 12x-48+6x-12-16x-48=-28
<=> 2x-108=-28
<=> 2x = 80
<=> x = 40
3)<=> 4x-20-35+7x+50-10x=-3
<=> x-5=-3
<=> x=2
4) <=> -3x-15=-45-21
<=> 51=3x
<=> 17=x
5) 4x-28+15=-2x+14-10
<=> 6x-13=4
<=> 6x=17
<=> x = \(\frac{17}{6}\)
Chúc bạn học tốt
\(x:\dfrac{5}{4}-x\times\dfrac{2}{5}=\dfrac{16}{5}\)
=>\(x\times\dfrac{4}{5}-x\times\dfrac{2}{5}=\dfrac{16}{5}\)
=>\(x\times\left(\dfrac{4}{5}-\dfrac{2}{5}\right)=\dfrac{16}{5}\)
=>\(x\times\dfrac{2}{5}=\dfrac{16}{5}\)
=>\(x=\dfrac{16}{5}:\dfrac{2}{5}=\dfrac{16}{5}\times\dfrac{5}{2}=\dfrac{16}{2}=8\)
\(x\) :\(\dfrac{5}{4}\) - \(x\) \(\times\) \(\dfrac{2}{5}\) = \(\dfrac{16}{5}\)
\(x\) \(\times\) \(\dfrac{4}{5}\) - \(x\) \(\times\) \(\dfrac{2}{5}\) = \(\dfrac{16}{5}\)
\(x\) \(\times\) (\(\dfrac{4}{5}\) - \(\dfrac{2}{5}\)) = \(\dfrac{16}{5}\)
\(x\) \(\times\) \(\dfrac{2}{5}\) = \(\dfrac{16}{5}\)
\(x\) = \(\dfrac{16}{5}\) : \(\dfrac{2}{5}\)
\(x\) = 8