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\(\left(-5\right)-25-\left(-34\right)-4=\left(-5\right)+\left(-25\right)+34+\left(-4\right)=\left[\left(-5\right)+\left(-25\right)\right]+\left[34+\left(-4\right)\right]=\left(-30\right)+30=0\)
#Y/n
a, \(\dfrac{90}{37}-\dfrac{38}{25}-\dfrac{8}{25}-\dfrac{4}{25}\)
= \(\dfrac{90}{37}\) - \(\dfrac{38+8+4}{25}\)
= \(\dfrac{90}{37}\) - 2
= \(\dfrac{16}{37}\)
\(\dfrac{24}{29}\) + \(\dfrac{32}{41}\) + \(\dfrac{34}{29}\) + \(\dfrac{50}{41}\)
=(\(\dfrac{24}{29}\) + \(\dfrac{34}{29}\)) + (\(\dfrac{32}{41}\) + \(\dfrac{50}{41}\))
= \(\dfrac{58}{29}\) + \(\dfrac{82}{41}\)
= 2 + 2
= 4
5) Ta có: \(\dfrac{\left(5\sqrt{3}+\sqrt{50}\right)\left(5-\sqrt{24}\right)}{\sqrt{75}-5\sqrt{2}}\)
\(=\dfrac{5\left(\sqrt{3}+\sqrt{2}\right)\left(\sqrt{3}-\sqrt{2}\right)^2}{5\left(\sqrt{3}-\sqrt{2}\right)}\)
=1
\(\frac{5}{22}\cdot\frac{33}{17}+\frac{15\cdot101}{34}-\frac{30}{34}=\frac{5\cdot11\cdot3}{17\cdot11\cdot2}+\frac{15\cdot101-15\cdot2}{34}=\frac{15}{34}+\frac{15.99}{34}\)
=100*15/34=1500/34 (bấm máy tính) = 44.1176471....
a)
`9/2-3`
`=9/2-6/2`
`=3/2`
b)
`8/5xx25/12`
`=10/3`
c)
`4:3/7`
`=4xx7/3`
`=28/3`
\(143-43\times\left[\left(25:5^2\right)-5^2\right]=143-43\times\left(1-5^2\right)=143-43\times\left(-24\right)=143+1032=1175\)
143 -43 x [(25 : 52) - 52 ]
= 100 x [( 25 : 25 ) - 25 ]
= 100 x [ 1 - 25 ]
= 100 x - 24
= -2400
(-5)-4-(-34)-25
=(-9)+34-25
=25-25
=0
Hok toots^^!