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-3/17 + 2/3 + 3/17 = (-3/17 + 3/17) + 2/3
= 0/17 + 2/3 (mà 0 chia bất kì số nào cũng = 0 )
= 0 + 2/3
= 2/3
:)))
a,
ssh:(2017-2)/5+1=404
tổng:(2017+2)*404/2=407838
b,
8*9*14+6*7*12+19*4*18=2*2*2*2*7+2*3*2*2*3+19*2*2*9*2=8(2*7+3*3+19*9)=8*194=1552
a,-5/9 + 8/18 + -2/11 + 4/-9 + 7/15 b,5/17 + -9/15 + -2/17 + 2/5 + 14/17
= -5/9 + 4/9 + -2/+ 4/-9 + 7/15 = 5/17 + -3/5 + -2/17 + 2/5 + 14/17
=(-5/9 + 4/9 + -4/9 ) +-2/11 + 7/15 = ( 5/17 + -2/17 + 14/17) + ( 2/5 + -3/5)
= -1/3 + -2/11 + 7/15 =1 + -1/5
=-75/225 + -30/ 225 + 77/225 =4/5
= -25/225 = -1/9 ( 4/5 = 0.8 )
\(\frac{9}{4}.\frac{7}{17}+2\frac{1}{4}.\frac{3}{17}-2,25.\frac{13}{17}\)
\(=\frac{9}{4}.\frac{7}{17}+\frac{9}{4}.\frac{3}{17}-\frac{9}{4}.\frac{13}{17}\)
\(=\frac{9}{4}.\left(\frac{7}{17}+\frac{3}{17}-\frac{13}{17}\right)\)
\(=\frac{9}{4}.\frac{-3}{17}\)
\(=\frac{-27}{68}\)
Nhớ k cho mình nhé
a) 2 + (-25) + 41+ (-2) + 25 +(-41)
= (-2 + 2) + (-25 + 25) + (-41 +41)
=0 + 0 + 0
=0
b) 10+ ( -17) +5 + (-7)+ 17 + (-15)
= (-15+10+5) + (-17+7) + 7
= 0 + 0 + 7
= 7
c)(-22) + (-14) + 17 + (-24) + 13+ 30
= [(-22) + (-14) + (-24)] + (17 + 13 + 30)
=-60 + 60
=0
a) 2 + (-25) + 41+ (-2) + 25 +(-41)
= (-2 + 2) + (-25 + 25) + (-41 +41)
=0 + 0 + 0
=0
\(M=\frac{17}{5}\cdot\frac{1}{2}\cdot\frac{10}{17}\cdot\frac{-1}{2^3}\)
\(=\frac{17}{5}\cdot\frac{10}{17}\cdot\frac{1}{2}\cdot\frac{-1}{8}\)
\(=\frac{17\cdot10}{5\cdot17}\cdot\frac{1\cdot(-1)}{2\cdot8}\)
\(=\frac{1\cdot2}{1\cdot1}\cdot\frac{1\cdot(-1)}{2\cdot8}\)
\(=2\cdot\frac{-1}{16}=\frac{2\cdot(-1)}{16}=\frac{1\cdot(-1)}{8}=\frac{-1}{8}\)
\(M=\frac{17}{5}.\frac{1}{2}.\frac{10}{17}.\frac{-1}{2^3}\)
\(\Leftrightarrow M=\frac{17}{5}.\frac{1}{2}.\frac{10}{17}.\frac{-1}{8}\)
\(\Leftrightarrow M=\left(\frac{17}{5}.\frac{10}{17}\right)\left(\frac{1}{2}-\frac{-1}{8}\right)\)
\(\Leftrightarrow M=2.\frac{-1}{16}\)
\(\Leftrightarrow M=\frac{-2}{16}=\frac{-1}{8}\)
a) 2 + (- 25) + 41 +(-2) +25 +(-41)= (-2 +2)+(-25+25)+(-41+41) = 0+0+0+0 = 0
b) 10 + (-17) + 5 + (-7) + 17+(-15) =(-17+17)+(10+5-15)+(-7) = 0+0-7 = -7
c) (-22) + (-14)+17 +(-24)+ 13 +30 = (-22 -14 -24) + ( 17 + 30 + 13 ) = -60 + 60 = 0
\(\left(-17\right)\cdot45\cdot0\cdot\left(-2\right)\)
\(=0\cdot17\cdot2\cdot45\)
=0
( - 17 ) . 45 . 0 . ( - 2 )
= ( -17 ) . 0 . ( - 2 )
= 0 . ( - 2 )
=0