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a,-(168+325) + ( 168 + 425 )
= -168 - 325 + 168 + 425
= [ ( -168 ) + 168 ] + [ ( -325 ) + 425]
= 0 + 100
= 100
\(a,31.\left(-18\right)+31.\left(-81\right)-31\)
\(=31\left(-18-81-1\right)\)
\(=31\left(-100\right)\)
\(=-3100\)
\(b,13\left(23+22\right)-3\left(17+28\right)\)
\(=299+286-51-84\)
\(=450\)
a) \(\frac{304}{60}=\frac{9}{135}-x\)
\(\Rightarrow x=\frac{9}{135}-\frac{304}{60}\)
\(\Rightarrow x=-5\).
Vậy \(x=-5.\)
b) \(\frac{-1}{2}+\frac{16}{124}+x-\frac{5}{31}=\frac{2}{62}\)
\(\Rightarrow\frac{-1}{2}+\frac{4}{31}+x-\frac{5}{31}=\frac{1}{31}\)
\(\Rightarrow\frac{-1}{2}+x=\frac{1}{31}-\frac{4}{31}+\frac{5}{31}\)
\(\Rightarrow\frac{-1}{2}+x=\frac{2}{31}\)
\(\Rightarrow x=\frac{2}{31}-\frac{-1}{2}\)
\(\Rightarrow x=\frac{35}{62}\)
Vậy \(x=\frac{35}{62}\)
c) \(\frac{2}{17}+\frac{15}{24}-\frac{15}{27}-x-\frac{8}{23}=0\)
\(\Rightarrow\left(\frac{2}{17}+\frac{5}{8}-\frac{5}{9}\right)-x=\frac{8}{23}\)
\(\Rightarrow\frac{229}{1224}-x=\frac{8}{23}\)
\(\Rightarrow x=\frac{229}{1224}-\frac{8}{23}\)
\(\Rightarrow x=\frac{-4525}{28152}\)
Vậy \(x=\frac{-4525}{28152}\)
\(\Rightarrow x=\frac{385}{186}\).
\(\left|-34\right|+(-4)\cdot(-1)^{2008}+(17-19)^2\)
\(=34+4+(-2)^2\)
\(=34+4+4\)
\(=42\)
\((-31)\cdot81-18\cdot31-31\)
\(=31\cdot(-81)-18\cdot31-31\)
\(=31\cdot(-81)-18-1\)
\(=31\cdot(-100)=-3100\)
a, \(\left(-75\right)+\left(-325\right)=-400\)
b, \(62+\left|-128\right|=62+128=190\)
c, \(\left(-125\right)+\left|-45\right|=-125+45=-80\)
d, \(\left|-135\right|+\left|70\right|=135+70=205\)
Chúc bạn học tốt!!! Cái bài này lần sau dùng máy tính nhá!
a) (-75) + (-325)=-400
b) 62 + |-128|=62+128= 190
c) (-125) + |-45|=-80
d) |-135| + |70| = 205
Chúc bạn học tốt
135*57+135*86-35*143= 135 (57+86)-35*143=135*143-35*143=143 (135-35)=143*100=14300
91*47+49*53-18*47+24*53=(91*47-18*47)+(49*53+24*53)=47*(91-18)+53*(49+24)=47*73+53*73=73*(47+53)=73*100=7300
31.(-18)+31.(-81)-31
= 31.[(-18)+(-81)]
= 31.(-100)
= -3100
135.(171-123)-171.(135-123)
=(135.171-135.123)-(171.135-171.123)
=135.171-135.123-171.135+171.123
=(135.171-171.135)-(135.123-171.123)
=0-123.(135-171)
=0-(-4428)=4428
K)-(-2009+97)-74.(-18)+74.(-118)-2009-3
=2009-97-74.(-18)+74.(-118)-2009-3
=2009-97-74.[(-18)+118]-2009-3
=(2009-2009)-74.100-(97+3)
=0-7400-100
=-7400-100=-7500
Mik bổ sung thêm nha
\(\left|x-11\right|=7\)
\(\Leftrightarrow\orbr{\begin{cases}x-11=7\\x-11=-7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=18\\x=4\end{cases}}\)
d,\(\left(3x-12\right)\left(x+31\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x-12=0\\x+31=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=4\\x=-31\end{cases}}\)
a)31.14+31.(2.43)
=31.14+31.86
=31(14+86)
=31.100
=3100
b)135.(-24)+135.(-75)-135.1
=135[(-24)+(-75)-1]
=135.(-100)
=-13500
a, 31 . 14 + 62 . 43
= 31.14 + 31.86
= 31.(14 + 86)
= 31.100
- 3100
b, -135 . 24 +135 . (-75) - 135
= -135.(24 + 75 + 1)
= -135.100
= -13500