`1a)-927+1421+930+(-1421)`
`=(-927+930)+(1421-1421)`
`=3`
`b)(-50+19+143)-(-79+25+48)`
`=112+6`
`=118`
`c)2.(-25).(-4).50-{-2+5-[10-(6-30)].-27-3}`
`=1000-{3+918-3}`
`=1000-3-918+3`
`=2`
`d)|0|+|45|+(-|-455|+|-796|)`
`=0+45-455+796`
`=45-455+796`
`=386`
`e)(-134)+51.134+(-134).48`
`=134.(-1)+51.134+134.(-48)`
`=134.(-1+51-48)`
`=134.2`
`=268`
`2a)15(13+x)=24-18`
`→195+15x=24-18`
`→15x=24-18-195`
`→15x=-189`
`→x=-63/5`
Vậy `x=-63/5`
`b)x+(-32)-(-42)-(-9)=-52`
`→x-32+42+9=-52`
`→x=-52+32-42-9`
`→x=-71`
Vậy `x=-71`
`c)5-x=17-(-5)`
`→5-x=17+5`
`→-x=17+5-5`
`→-x=17`
`→x=-17`
Vậy `x=-17`
`d)x+2x+x+91=-5`
`→4x=-5-91`
`→4x=-96`
`→x=(-96):4`
`→x=-24`
Vậy `x=-24`
`e)-152-(3x+1)=(-2).(-27)`
`→-152-3x-1=54`
`→-3x=54+152+1`
`→-3x=207`
`→x=207:(-3)`
`→x=-69`
Vậy `x=-69`
`f)(3x-4)^2=5-(-11)`
`→(3x-4)^2=5+11`
`→(3x-4)^2=16`
`→(3x-4)^2=4^2`
`→`\(\left[ \begin{array}{l}3x-4=4\\3x-4=-4\end{array} \right.\)
`→` \(\left[ \begin{array}{l}3x=8\\3x=0\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=\dfrac{8}{3}\\x=0\end{array} \right.\)
Vậy `x∈{8/3;0}`
