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124,5+62,7-12,7

=> 124,5+62,7-12,7

=>124,5+50

=174,5

73,8-12,6-34,4

=> 73,8-34,4-12,6

=> 39,4-12,6

=26,8

(62,7 : 1,2 - 38,4). 8,52 + 14,64 

= (52,25 - 38,4). 8,52 + 14,64

= 13,85 . 8,52 + 14,64

= 118,002 + 14,64

= 132,642

73,8-12,6-34,4

=61,2-34,4

=26,8

t tôi nha bn

61,2-34,4=28,6

 = 73,8 - ( 12,6 + 34,4 ) = 73,8 - 47 = 26,8

k mk nha

73,8-12,6-34,4

=73,8-(12,6+34,4)

=73,8-47

=26,8 nha bn

dug thì nhớ cho mik nha

73,8 - 12,6 - 34,4

= 73,8 -  ( 12,6 + 34,4 )

= 73,8 - 47

= 26,8

\(\left(1-\dfrac{1}{3}\right)\times\left(1-\dfrac{3}{7}\right)\times\left(1-\dfrac{3}{10}\right)\times\left(1-\dfrac{3}{97}\right)\times\left(1-\dfrac{3}{100}\right)\)

\(=\dfrac{2}{3}\times\dfrac{4}{7}\times\dfrac{7}{10}\times...\times\dfrac{94}{97}\times\dfrac{97}{100}\)

\(=\dfrac{2\times4\times7\times...\times94\times97}{3\times7\times10\times...\times97\times100}\)

\(=\dfrac{2\times4}{3\times100}=\dfrac{8}{300}=\dfrac{2}{75}\)

\(A=\dfrac{2}{3}\cdot\dfrac{4}{7}\cdot\dfrac{7}{10}\cdot...\cdot\dfrac{94}{97}\cdot\dfrac{97}{100}=\dfrac{2}{3}\cdot\dfrac{1}{25}=\dfrac{2}{75}\)

=73,8x11-73,8x1

=73,8x(11-1)

=73,8x10=738

\(=73,8\times11-73,8\times1\)

\(=73,8\times\left(11-1\right)\)

\(=73,8\times10\)

\(=738\)

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73,8 x 11 - 73,8 = 73,8 x 11 - 73,8 x 1

                       = 73,8 x ( 11 - 1 )

                       = 73,8 x 10

                       = 738

a) \(29.31=\left(30-1\right)\left(30+1\right)=30^2-1=900-1=899\)

b) \(33,3^2-2.33,3.3,3+3,3^2=\left(33,3-3,3\right)^2=30^2=900\)

c) \(20,1.19,9=\left(20+0,1\right)\left(20-0,1\right)=20^2-0,1^2=400-0.01=399,99\)

d) \(37^2+2.37.13+13^2=\left(37+13\right)^2=50^2=2500\)

a, \(29.31=\left(30-1\right)\left(30+1\right)=30^2-1=899\)

b, \(33,3^2-2.33,3.3,3+3,3^2=\left(33,3-3,3\right)^2=30^2=900\)

c, \(20,1.19,9=\left(20-0,1\right)\left(20+0,1\right)=20^2-0,1^2=399,99\)

d, \(37^2+2.37.13+13^2=\left(37+13\right)^2=50^2=2500\)

a: \(29\cdot31=30^2-1=900-1=899\)

b: \(33.3^2-2\cdot33.3\cdot3.3+3.3^2\)

\(=\left(33.3-3.3\right)^2\)

=900

c: \(20.1\cdot19.9=20^2-0.1^2=399.9\)

d: \(37^2+2\cdot37\cdot13+13^2=\left(37+13\right)^2=2500\)