2/3-5/7.14/225
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\(\dfrac{4}{5}\)+\(\dfrac{-5}{4}\)=\(\dfrac{0}{4}\)
\(\dfrac{-1}{3}\)+\(\dfrac{2}{5}-\dfrac{5}{6}\)=\(\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}\)=\(\dfrac{-23}{30}\)
\(\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}\)=\(\dfrac{2}{3}-\dfrac{2}{5}\)=\(\dfrac{10}{15}-\dfrac{6}{15}\)=\(\dfrac{4}{15}\)
`#` `\text{dkhanhqlv}`
`4)`
`a)3.(-5/11)`
`=-15/11`
`b)3/5+4/7 . 14/6`
`=3/5 + 4/3`
`=9/15+20/15`
`=29/15`
`c) 10/21-3/8 . 4/15`
`=10/21-1/10`
`=100/210-21/210`
`=79/100`
`d)(2/3+3/4)(5/7+5/14)`
`=(8/12+9/12)(10/14+5/14)`
`=17/12 . 15/14`
`=85/56`
`5)`
`a)x-1/2=3/10 . 5/6`
`=>x-1/2=1/4`
`=>x=1/4+1/2`
`=>x=1/4+2/4`
`=>x=3/4`
`b)x/5 = -3/14`
`=>x : 5 = -3/14`
`=>x=-3/14 . 5`
`=>x=-15/14`
`c)x+2/3=9/15 . 5/27`
`=>x+2/3=1/9`
`=>x=1/9-2/3`
`=>x=1/9-6/9`
`=>x=-5/9`
\(7.14+7.14+7.14\cdot8\)
\(=7.14\cdot\left(1+1+8\right)\)
\(=7.14\cdot10\)
\(=71.4\)
k hộ mk nhé!!!!
~ học tốt ~
\(7,14+7,14+7,14\)x \(8\)
\(=7,14X3X8\)
\(=21,42X8=171,36\)
7 x 14m2 +7 x 14m2 + 7 x 14m2
= (7+7+7) x ( 14m2+ 14m2+ 14m2)
=7 x 3 + 14m2x 3
=21 + 42m2
\(\frac{5}{7}.\frac{5}{11}+\frac{5}{7}.\frac{2}{11}-\frac{5}{7}.\frac{14}{11}\)
\(=\frac{5}{7}.\left(\frac{5}{11}+\frac{2}{11}-\frac{14}{11}\right)\)
\(=\frac{5}{7}.\frac{-7}{11}\)
\(=\frac{-5}{11}\)
5/7.5/11+5/7.2/11-5/7.14/11
= 5/7.(5/11+2/11-14/11)
=5/7.-7/11
=-5/11
\(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{225}\)
\(=\frac{2}{3}-\frac{2}{45}\)
\(=\frac{28}{45}\)
Tk mk nha!
\(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{225}\)
\(=\frac{2}{3}-\frac{5\cdot14}{7\cdot225}\)
\(=\frac{2}{3}-\frac{5\cdot7\cdot2}{7\cdot5\cdot45}\)
\(=\frac{2}{3}-\frac{2}{45}\)
\(=\frac{30}{45}-\frac{2}{45}\)
\(=\frac{28}{45}\)
tk mình nha! ◘_◘