a) \(23\times57+42\times23+23=23\times\left(57+42+1\right)\)
\(=23\times100=2300\)
b) \(\frac{2}{9}\times\frac{5}{7}+\frac{2}{9}\times\frac{2}{7}=\frac{2}{9}\times\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=\frac{2}{9}\times1=\frac{2}{9}\)
a) 23 x 57 + 42 x 23 + 23
= 23 x ( 57 + 42 + 1 )
= 23 x 100
= 2300
b) \(\frac{2}{9}\times\frac{5}{7}+\frac{2}{9}\times\frac{2}{7}\)
\(=\frac{2}{9}\times\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=\frac{2}{9}\times1\)
\(=\frac{2}{9}\)
Học tốt #
a) \(23\text{}\times57+42\text{}\times23+23\)
\(=23\text{}\times\left(57+42+1\right)\)
\(=23\text{}\times100\)
\(=2300\)
b) \(\frac{2}{9}\text{}\times\frac{5}{7}+\frac{2}{9\text{}}\text{}\times\frac{2}{7}\)
\(=\frac{2}{9}\text{}\times\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=\frac{2}{9}\text{}\times1\)
\(=\frac{2}{9}\)
_Chúc bạn học tốt_
a) 23 x 57 +42 x 23 +23 = 23 x 57 +42 x 23 +23 x 1
= 23 x (57 +42 +1) = 23 x 100 = 2300.
b) \(\frac{2}{9}\)x \(\frac{5}{7}\)+ \(\frac{2}{9}\)x \(\frac{2}{7}\)=\(\frac{2}{9}\) x \(\left(\frac{5}{7}+\frac{2}{7}\right)\)
=\(\frac{2}{9}\)x \(\frac{7}{7}\)= \(\frac{2}{9}\)x \(1\)= \(\frac{2}{9}\).
k mik nhé !!
a, \(23\times57+42\times23+23\)\(=23\times\left(57+42+1\right)\)\(=23\times100=2300\)
b, \(\frac{2}{9}\times\frac{5}{7}+\frac{2}{9}\times\frac{2}{7}\)\(=\frac{2}{9}\left(\frac{5}{7}+\frac{2}{7}\right)=\frac{2}{9}\)
a) 23x57+42x23+23
=23x(57+42+1)
=23x100
=2300
b) \(\frac{2}{9}\cdot\frac{5}{7}+\frac{2}{9}\cdot\frac{2}{7}\)
\(=\frac{2}{9}\cdot\left(\frac{5}{7}+\frac{2}{7}\right)\)
\(=\frac{2}{9}\cdot1=\frac{2}{9}\)
= 23 x ( 57 + 42 + 1 )
= 23 x 100
= 2300
= 2 / 9 x ( 5 / 7 + 2 / 7 )
= 2 /9 x 1
= 9 / 2