Bài 15:
g )(2-5) ² +|3|+(-5) ²
h ) |-15+32|.(-2) -18
i ) |-12|+(-7+10) ^3-25.(-2)
j )16: (-2)+15.(-4)+(-2)^3
k )79-(-19)+19.5-5
l ) (-17+35):(-3)^2
Bài 17:
a)x+17=5
b) 85-x=-16
c) 18+2x=24
k) |x-3|=5
l) |x|+5=8
HELP ME !!!
:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(:(
Đáp án:
Giải thích các bước giải:
Bài 15:
g )(2-5) ² +|3|+(-5) ²
=(-3)²+3+(-5) ²
=9+3+25
=37
h ) |-15+32|.(-2) -18
=17.(-2) -18
=-34-18
=-52
i ) |-12|+(-7+10) ³-25.(-2)
=12+(-7+10) ³-25.(-2)
=12+27-25.(-2)
=12+27+50
=89
j )16: (-2)+15.(-4)+(-2)³
=-8-60-8
=-76
k )79-(-19)+19.5-5
=79-(-19)+95-5
=79-(-19)+95-5
=98+95-5
=193-5
=188
l ) (-17+35):(-3)²
=18:9
=2
Bài 17:
a)x+17=5
x=5-17
x=-12
b) 85-x=-16
x=85-(-16)
x=101
c) 18+2x=24
2x=24-18
2x=6
x=6:2
x=3
k) |x-3|=5
⇒ x-3=5 hoặc x-3=-5
x=5+3 x=-5+3
x=8 x=-2
l) |x|+5=8
/x/=8-5
/x/=3
⇒x=±3
`15`
`g )(2-5) ² +|3|+(-5) ²`
`=(-3)^2+3+25`
`=9+3+25`
`=37`
`h ) |-15+32|.(-2) -18`
`=|17|.(-2)-18`
`=-34-18`
`=-52`
`i ) |-12|+(-7+10) ^3-25.(-2)`
`=12+3^3+50`
`=12+27+50`
`=89`
`j )16: (-2)+15.(-4)+(-2)^3`
`=-8+(-60)+(-8)`
`=-76`
`k )79-(-19)+19.5-5`
`=79+19+95-5`
`=188`
`l ) (-17+35):(-3)^2`
`=18:9`
`=2`
`17`
`a)x+17=5`
`→x=5-17`
`→x=-12`
Vậy `x=-12`
`b)85-x=-16`
`→x=85-(-16)`
`→x=101`
Vậy `x=101`
`c)18+2x=24`
`→2x=24-18`
`→2x=6`
`→x=3`
Vậy `x=3`
`k)|x-3|=5`
`→` \(\left[ \begin{array}{l}x-3=5\\x-3=-5\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=8\\x=-2\end{array} \right.\)
Vậy `x∈{8;-2}`
`l)|x|+5=8`
`→|x|=8-5`
`→|x|=3`
`→` \(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\)
Vậy `x∈{3;-3}`