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47. (23 + 50)- 23. ( 47+50 )
= 47. 23+ 47. 50- 23. 47 - 23. 50
=47. 50 - 23. 50
= 50 .( 47 -23)
=50. 24 = 1200
\(a.-14-x=-8\)
\(x=-6\)
\(b.11+x+20=32\)
\(31+x=32\)
\(x=1\)
\(c.5-\left(x-8\right)=63\)
\(x-8=-58\)
\(x=-50\)
a,\(\left(-14-x\right)+13=5\)
\(\Rightarrow-x+1=5\)
\(\Rightarrow-x=4\)
\(\Rightarrow x=-4\)
b,\(\left(11+x\right)-\left(-11-9\right)=32\)
\(\Rightarrow11+x+11+9=32\)
\(\Rightarrow x+31=32\)
\(\Rightarrow x=1\)
c,\(5-\left(x-8\right)+\left(-21\right)=42\)
\(\Rightarrow5-x+8-21=42\)
\(\Rightarrow-x-8=42\)
\(\Rightarrow x=-50\)
(-37) + 14 + 26 + 37 = [ (-37) + 37 ] + (14 + 26)= 0 + 40 = 40
(-24) + 6 + 10 + 24 = [(-24) + 24] + 6 + 10 = 16
15 +23 + (-25) + (-23) = [15 + (-25)] + [23+ (-23)]= -10 + 0= -10
60 + 33 + (-50) + (-33) =60 + (-50) + [ 33 + (-33)] = 10
\(\left(-37\right)+14+26+37\)
\(=\left[\left(-37\right)+37\right]+\left(14+26\right)\)
\(=0+40\)
\(=40\)
\(\left(-24\right)+6+10+24\)
\(=\left[\left(-24\right)+24\right]+\left(6+10\right)\)
\(=0+16\)
\(=16\)
\(15+23+\left(-25\right)+\left(-23\right)\)
\(=\left[23+\left(-23\right)\right]+\left[15+\left(-25\right)\right]\)
\(=0+\left(-10\right)\)
\(=-10\)
\(60+33+\left(-50\right)+\left(-33\right)\)
\(=\left[\left(-33\right)+33\right]+\left[\left(-50\right)+60\right]\)
\(=0+10\)
\(=10\)
Tìm x :
a. -x + 17 = -12
x = (-12) -17
x = -29
b. -30 + (32-x) = 10
32-x = 10-(-30)
32-x = 40
x = 32 - 40
x = -8
c. \(|2x-1|\) = 7
=> 2x - 1 = 7 hoặc => 2x - 1 = -7
=> x = 4 => x = -3
d. \(|x+3|\) - 5 = 7
\(|x+3|\) = 7 + 5
\(|x+3|\) = 12
=> x + 3 = 12 hoặc => x + 3 = -12
=> x = 12 - 3 => x = (-12) - 3
=> x = 9 => x = -15
e. 16 - ( 42 + x ) = 50
42 + x = 16 - 50
42 + x = -34
x = (-34) - 42
x = -76
g. 128 - 3 . ( x + 4 ) = 23
3 . ( x + 4 ) = 128 - 23
3 . ( x + 4 ) = 105
x + 4 = 105 : 3
x + 4 = 35
x = 35 - 4
x = 31
a) -24 + 13 + 6 + 24
= 24 + (-24) + 13 +6
= 0+13+6
= 19
b ) 28 + ( -6 ) - 50 + 6
= 6 + (-6 ) + 28 -50
= 0 +28 - 50
= 28 -50
= -22
a) ( -24 + 24) + 13 + 6 = 19
b) 28 - 50 + ( -6 + 6) = -22
c) ( -27 - 73 ) + (-789 + 789) + 9 = -91
d) {[ -23 + ( -17) ] - 10} + 50 = -50 + 50 = 0
19 + ( x - 23 ) = 50
x - 23 = 50 - 19
x - 23 = 31
x = 31 + 23
x = 54
nha bn
-23-(10-x)=50
10-x = - 23-50
10 -x = - 73
x=10+73
x=83
-23 - (10 - x) = 50
10 -x = -23 - 50
10 -x = -73
x = 73 + 10
x = 83