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\(52-42+37-28+38+63\)
\(=\left(52-42\right)+\left(-28+38\right)+\left(37+63\right)\)
\(=10+10+100\)
\(=120\)
\(=\left(52-42\right)+\left(37+63\right)+\left(28-38\right)\\ =10+100-10=100\)
c ) 815 - 23 - 77 + 185
= ( 815 + 185 ) - ( 23 + 77 )
= 1000 - 100 = 900
m ) 8 x 427 x 3 + 6 x 573 x 4
= 24 x 427 + 24 x 573
= 24 x ( 427 + 573 )
= 24 x 1000
= 24000
g ) 52 - 42 + 37 + 28 - 38 + 63
= ( 52 + 28 ) - ( 42 + 38 ) + ( 37 + 63 )
= 80 - 80 + 100
= 0 + 100
= 100
h ) 35 x 18 - 9 x 70 + 100
= 7 x 5 x 9 x 2 - 9 x 7 x 5 x 2 + 100
= 0 + 100
= 100
n ) 2008 x 867 + 2009 x 133
= 2008 x 867 + ( 2008 + 1 ) x 133
= 2008 x 867 + 2008 x 133 + 133
= 2008 x ( 867 + 133 ) + 133
= 2008 x 1000 + 133
= 2008000 + 133
= 2008133
i ) 326 x 78 + 327 x 22
= 326 x 78 + ( 326 + 1 ) x 22
= 326 x 78 + 326 x 22 + 22
= 326 x ( 78 + 22 ) + 22
= 326 x 100 + 22
= 32600 +22
= 32622
q ) ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 2 x 8 )
= ( 20 + 21 + 22 + 23 + 24 + 25 ) x ( 16 - 16)
= ( 20 + 21 + 22 + 23 + 24 + 25 ) x 0
= 0
a) 1+2+3+4+5+6+7+8+9
= (1+9)+(2+8)+(3+7)+(4+6)+5
= 10+10+10+10=5
= 45
b) 19+28+37+46+81+72+63+54
= (19+81)+(28+72)+(46+54)+(63+37)
= 100+100+100+100
= 400
a) \(38+42+46+50+54+58+62\)
\(=\left(38+62\right)+\left(42+58\right)+\left(46+54\right)+50\)
\(=100+100+100+50\)
\(=100\cdot3+50\)
\(=350\)
b) \(11+137+72+63+128+89\)
\(=\left(11+89\right)+\left(137+63\right)+\left(72+128\right)\)
\(=100+200+200\)
\(=300+200\)
\(=500\)
A) = (38 + 62) + (42 + 58) + (46 + 54) + 50
= 100 + 100 + 100 + 50
= 350
B) = (11 + 89) + (137 + 63) + (72 + 128)
= 100 + 200 + 200
= 500
\(\frac{2}{3}+\frac{14}{15}+\frac{34}{35}+\frac{62}{63}+\frac{98}{99}\)
\(=\frac{3-1}{3}+\frac{15-1}{15}+\frac{35-1}{35}+\frac{63-1}{63}+\frac{99-1}{99}\)
\(=1-\frac{1}{3}+1-\frac{1}{15}+1-\frac{1}{35}+1-\frac{1}{63}+1-\frac{1}{99}\)
\(=5+\left(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}\right)\)
\(=5+\frac{1}{2}\left(1-\frac{1}{11}\right)\)
\(=5+\frac{5}{11}=\frac{60}{11}\)
= 100 nha bn, nhớ k mình đó
62 - 52 + 37 + 28 - 38 + 63
= ( 62 +28 ) + ( 37 + 63 ) + ( 52 - 38 )
= 90 + 100 + 14
= 204