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mk chỉ làm ý A thui nha
\(A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(A=71+x+24+x+\left(-35\right)-x\)
\(A=\left[71+24+\left(-35\right)\right]+\left(x+x-x\right)\)
\(A=60+x\)
Vậy \(A=60+x\)
\(a,A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(=71+x+24+x-35-x\)
\(=60+x\)
\(b,B=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)
\(=x-34-\left(15+x-23+x\right)\)
\(=x-34-15-x+23-x\)
\(=-x-26\)
b,-146+|-37|-(37-146)= -146 + 37 - 37+ 146
= (-146+146)+(37-37)
=0
=\(\frac{15}{4}.\left(\frac{4}{90.94}+\frac{4}{94.98}+...+\frac{4}{146.150}\right)\)
=\(\frac{15}{4}.\left(\frac{1}{90}-\frac{1}{94}+\frac{1}{94}-\frac{1}{98}+...+\frac{1}{146}-\frac{1}{150}\right)\)
=\(\frac{15}{4}.\left(\frac{1}{90}-\frac{1}{150}\right)\)
=\(\frac{15}{4}.\frac{2}{450}\)
=\(\frac{1}{60}\)
\(dungthikkothithoithanks\)
a) ( 71 + x ) - ( -24 - x ) + ( -35 - x )
= 71 + x + 24 + x - 35 - x
= ( 71 + 24 - 35 ) + ( x + x - x )
= 60 + x
b) x - 34 - [( 15 + x ) - ( 23 - x )]
= x - 34 - ( 15 + x - 23 + x )
= x - 34 - ( 15 - 23 + x2 )
= x - 34 - ( - 8 + 2x )
= x - 34 + 8 - 2x
= x - 2x + 8 - 34
= -x - 26
c) ( -15 + |x| ) + ( -25 - |x| )
= -15 + |x| - 25 + |x|
= -15 - 25 + x + x
= -40 + x2
a)(71+x)-(-24-x)+(-35-x)
=>71+x+24+x-35-x
=>60+x
b)x-34-[(15+x)-(23-x)]
=>x-34-(15+x-23+x)
=>x-34-15-x+23-x
=-x-26
71-2(15+x) = 21
2(15+x) = 71-21
2(15+x) = 50
15+x = 50:2
15+x = 25
x = 25-15
x = 10
71 - 2 . (15+ x ) =21
=> 2 . ( 15 + x ) = 71 - 21
=> 2 . ( 15 + x ) = 50
=> 15 + x = 50 : 2
=> 15 + x = 25
=> x = 25 - 15
=> x = 10
Vậy x = 10
=>15x=146-71
=>15x=75
=>x=75:15
=>x=5
Vậy x=5
146 - 15 X = 71
15 X = 146 - 71
15 X = 75
X = 75 : 15
X = 5