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a, 56 x 12 + 24 x 36 + 24 x36 = 56 x 12 + 12 x 2 x 36 + 12 x 2 x 36
= 56 x 12 + 12 x 72 + 12 x 72
= 12 x ( 56 + 72 + 72 )
= 12 x 200
= 2400
b, 2005 x 178 - 77 x 2005 - 2005 = 2005 x ( 178 - 77 - 1 )
= 2005 x 100
= 200500
**** mình nha nguyễn thùy trang
\(\frac{22}{77}+\frac{56}{98}+\frac{25}{105}\)
\(=\frac{6}{7}+\frac{25}{105}\)
\(=\frac{23}{21}=1\frac{2}{21}\)
\(\frac{56}{24}=\frac{7}{3};\frac{33}{77}=\frac{3}{7}\)
a. \(\frac{22}{55}\)+ \(\frac{25}{125}\)+ \(\frac{1020}{5100}\)
= \(\frac{2}{5}\)+ \(\frac{1}{5}\)+ \(\frac{1}{5}\)
= \(\frac{4}{5}\)
B. \(\frac{22}{77}\)+ \(\frac{56}{98}\)+ \(\frac{25}{105}\)
= \(\frac{2}{7}\)+ \(\frac{4}{7}\)+ \(\frac{5}{21}\)
= \(\frac{6}{7}\)+ \(\frac{5}{21}\)
= \(\frac{23}{21}\)
a)\(\dfrac{22}{25}+\dfrac{25}{125}+\dfrac{36}{96}\)
\(=\dfrac{22}{25}+\dfrac{1}{5}+\dfrac{3}{8}\)
\(=\dfrac{176}{200}+\dfrac{40}{200}+\dfrac{75}{200}\)
\(=\dfrac{291}{200}\)
b)\(\dfrac{22}{77}+\dfrac{56}{98}+\dfrac{25}{105}\)
\(=\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{5}{21}\)
\(=\dfrac{6}{7}+\dfrac{5}{21}\)
\(=\dfrac{18}{21}+\dfrac{5}{21}=\dfrac{23}{21}\)
A;18/27=2/3;24/56=3/7
Vay2/3<3/7
B36/90=2/5;50/125=2/5
2/5=2/5
C121/77=11/7;88/64=11/8
vai11/7co mau be hon 11/8 ma tu bang nhau nen
11/7>11/8
D52/91=4/7,60/84=5/7
phan so co mau bang nhau tu cua 5/7 lon hon4/7 nen 4/7<5/7
tich nha
=4312 nha
Hok tot!
77 x 56 = 4312