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2/3 x 4/5 + 4/5 x 8/3 = 4/5 x (2/3 + 8/3) = 4/5 x 10/3 = 8/3
27/32 x 16/9 -27/32 x7/9 + 27/32
= 27/32 x (16/9 - 7/9 + 1 )
=27/32 x 2
=27/16
\(\frac{2}{3}\) x \(\frac{4}{5}\) + \(\frac{4}{5}\) x \(\frac{8}{3}\)
=\(\frac{4}{5}\) x ( \(\frac{2}{3}\) + \(\frac{8}{3}\) )
= \(\frac{4}{5}\) x \(\frac{10}{3}\)
= \(\frac{40}{15}\) = \(\frac{8}{5}\)
58 x 42 + 32 x 8 + 5 x 16
= 116 x 21 + 16 x 16 + 5 x 16
= 116 x 21 + 16(16 + 5)
= 116 x 21 + 16 x 21
= 21 x ( 116 + 16 )
= 21x 132
= 2772
58*42+32*8+5*16
=58*42+2*16*8+5*16
=58*21*2+16*(2*8+5)
=58*21*2+16*21
=21*(58*2+16)
=21*(116+16)
=21*132
=2772
b: A=1/3+1/9+...+1/3^10
=>3A=1+1/3+...+1/3^9
=>A*2=1-1/3^10=(3^10-1)/3^10
=>A=(3^10-1)/(2*3^10)
c: C=3/2+3/8+3/32+3/128+3/512
=>4C=6+3/2+...+3/128
=>3C=6-3/512
=>C=1023/512
d: A=1/2+...+1/256
=>2A=1+1/2+...+1/128
=>A=1-1/256=255/256
85 x 42 + 32 x 8 + 5 x 16
=85 x 42 + 32 x 8 + 5 x 2 x 8
=85 x 42 + (32+10) x 8
=(85+8) x 42
=93 x 42
=3906
chúc bạn học tốt nha
\(85\times42\)\(+32\times8+5\times16\)
=\(3570+256+80\)
=3906
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 16 x 2 x 8 + 5 x 16
= 58 x 42 + 16 x ( 2 x 8 + 5 )
= 58 x 42 + 16 x 21
= 58 x 2 x21 + 16 x 21
= 21 x ( 58 x 2 + 16 )
= 21 x 132
= 2772
58 x 42 + 32 x 8 + 5 x 16
= 58 x 42 + 2 x 16 x 8 + 5 x 16
= 58 x 21 x 2 + 16 x ( 2 x 8 + 5 )
= 58 x 21 x 2 + 16 x 21
= 21 x ( 58 x 2 + 16 )
= 21 x ( 116 + 16 )
= 21 x 132
= 2772
\(58\times42+32\times8+5\times16\)
\(=16\times16+5\times16+58\times42\)
\(=16\times\left(16+5\right)+58\times42\)
\(=16\times21+58\times42\)
\(=16\times21+116\times21\)
\(=\left(16+116\right)\times21\)
\(=132\times21\)\(=2772\)
16 x 48 + 8 x 48 + 32 x 14
= 48 x ( 16 + 8 ) + 32 x 14
= 48 x 24 + 32 x 14
= 48 x 14 + 10 + 32 x 14
= 14 x ( 48 + 10 + 32 )
= 14 x 90
= 1260
\(5x32-32:8\)
\(=160-4\)
\(=156\)
\(5\times32-32:8\\ =5\times32-32\times\dfrac{1}{8}\\ =\left(5-\dfrac{1}{8}\right)\times32\\ =\dfrac{39}{8}\times32=156\)