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=> 20 x ( 10 + 9 + 11 ) + 10 x ( 2 + 3 + 4 + 1 )
=> 20 x 30 + 10 x 10
=> 600 + 100
=> 700
\(=\dfrac{7}{10}\times\left(3+5+2\right)=\dfrac{7}{10}\times10=7\)
a)\(12\times\frac{4}{5}=\frac{12\times4}{5}=\frac{48}{5}\)
b)\(150\times\frac{5}{3}=\frac{150\times5}{3}=\frac{750}{3}=250\)
( 3/8 + 2/8) +1/8= 3/8 + 2/8 +1/8= 3/8 + 3/8= 3/4
3/8 + (2/8 +1/8)= 3/8 + 2/8 +1/8= 3/8 + 3/8= 3/4
( 3/8 + 2/8) + 1/8....3/8+(2/8+1/8)= 3/4+.....+3/4
\(\left(\frac{3}{8}+\frac{2}{8}\right)+\frac{1}{8}=\frac{3}{8}+\left(\frac{2}{8}+\frac{1}{8}\right)=\frac{3}{8}+\frac{3}{8}=\frac{6}{8}=\frac{3}{4}\) (tính chất kết hợp)
\(\Rightarrow\left(\frac{3}{8}+\frac{2}{8}\right)+\frac{1}{8}=\frac{3}{8}+\left(\frac{1}{8}+\frac{2}{8}\right)\)
\(\frac{10}{8}+\frac{10}{8}+\frac{10}{8}+\frac{10}{8}+\frac{10}{8}+\frac{10}{8}+\frac{10}{8}+\frac{10}{8}\)
\(=\frac{10}{8}.8\)
\(=\frac{10.8}{8}=10\)
10/8 + 10/8 + 10/8 + 10/8 + 10/8 + 10/8 + 10/8 + 10/8
= 10/8 . 8
= 10
k mik nhé
77 x 8 + 15 x 8 + 8 x 8
= 8 x ( 77 + 15 + 8 )
= 8 x 100
= 800
64 x 4 + 8 x 4 + 9 x 2
= 4 x ( 64 + 8 ) +18
= 4 x 72 + 18
= 288 + 18
= 306
= 5 x 3 / 4
= 15/4
\(10\times\dfrac{3}{8}=5\times\dfrac{3}{4}=\dfrac{5\times3}{4}=\dfrac{15}{4}\)