a, -3/5+-7/24+19/24
b, -5/9.2/3+-5/9.11/13 +1/ 5/9
c, (-5/24+0,75+7/12)÷(-2/1/8)
d, 2017/2018.-1/2+-1/3.2017/2018.-1/6
Làm hết giúp mình.
a, -3/5+-7/24+19/24 b, -5/9.2/3+-5/9.11/13 +1/ 5/9 c, (-5/24+0,75+7/12)÷(-2/1/8) d, 2017/2018.-1/2+-1/3.2017/2018.-1/6 Làm hết giúp mình.
By Charlie
Đáp án:
a) -1/10
b)251/351
c)-9/17
d)-4034/9081
Giải thích các bước giải:
a)-3/5+-7/24+19/24
=-3/5+1/2
=-6/10+5/10=-1/10
b)-5/9.2/3+-5/9.11/13 +1/ 5/9
=-5/9(2/3+11/13)+1 5/9
=-5/9.59/39+14/9
=-295/351+14/9
=251/351
c)(-5/24+0,75+7/12)÷(-2/1/8)
=(-5/24+3/4+7/12):(-17/8)
=(-5/24+18/24+14/24):(-17/8)
=27/24:(-17/8)
=-9/17
d) 2017/2018.-1/2+-1/3.2017/2018.-1/6
=2017/2018(-1/2+-1/3.1/6)
=2017/2018.(-4/9)
=-4034/9081
Don’t worry, the right ones won’t leave.
a,$\frac{-3}{5}$ +$\frac{-7}{24}$ +$\frac{19}{24}$
=$\frac{-3}{5}$ + $\frac{1}{2}$
=$\frac{-1}{10}$
b,$\frac{-5}{9}$ .$\frac{2}{3}$ +$\frac{-5}{9}$ .$\frac{11}{13}$ +1 $\frac{5}{9}$
=$\frac{-5}{9}$ .($\frac{2}{3}$ +$\frac{11}{13}$ )+1 $\frac{5}{9}$
=$\frac{-5}{9}$ .$\frac{59}{39}$ + $\frac{14}{9}$
=$\frac{-295}{351}$ +$\frac{14}{9}$
=$\frac{251}{351}$
c.($\frac{-5}{24}$ +0,75+$\frac{7}{12}$ ) :(-2 $\frac{1}{8}$)
=($\frac{-5}{24}$ +$\frac{3}{4}$ +$\frac{7}{12}$ ):($\frac{-17}{8}$
= ($\frac{13}{24}$ +$\frac{7}{12}$ ) . $\frac{-8}{17}$
=$\frac{9}{8}$ .$\frac{-8}{17}$
=$\frac{-9}{17}$
d,$\frac{2017}{2018}$ . $\frac{-1}{2}$ +$\frac{-1}{3}$ .$\frac{2017}{2018}$ .$\frac{-1}{6}$
=$\frac{2017}{2018}$ .($\frac{-1}{2}$ +$\frac{-1}{3}$ .$\frac{-1}{6}$ )
=$\frac{2017}{2018}$ +($\frac{-1}{2}$ +$\frac{1}{18}$ )
=$\frac{2017}{2018}$ +$\frac{-4}{9}$
=$\frac{-4034}{9081}$
CHÚC BẠN HỌC TỐT!!!