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Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
tính nhanh 4/3*6 + 4/6*9 + 4/9*12 +4/23*27=24.0289855072
học tốt
\(\frac{4}{3\times6}+\frac{4}{6\times9}+\frac{4}{9\times12}+\frac{4}{23\times27}\)
\(=\frac{4}{3}\left(\frac{3}{3\times6}+\frac{3}{6\times9}+\frac{3}{9\times12}\right)+\frac{4}{23\times27}\)
\(=\frac{4}{3}\left(\frac{1}{3}-\frac{1}{6}+\frac{1}{6}-\frac{1}{9}+\frac{1}{9}-\frac{1}{12}\right)+\frac{4}{23\times27}\)
\(=\frac{4}{3}\times\frac{1}{4}+\frac{4}{23\times27}\)
\(=\frac{1}{3}+\frac{4}{23\times27}=\frac{23\times27+4}{3\times23\times27}\)
a)\(\left(\frac{25}{49}+\frac{17}{39}+\frac{22}{39}\times\frac{25}{49}\right)\times\frac{41}{25}\)
\(=\left(\frac{25}{49}+\left(\frac{17}{39}+\frac{22}{39}\right)\times\frac{25}{49}\right)\times\frac{41}{25}\)
\(=\left(\frac{25}{49}+\frac{39}{39}\times\frac{25}{49}\right)\times\frac{41}{25}\)
\(=\left(\frac{25}{49}+1\times\frac{25}{49}\right)\times\frac{41}{25}\)
\(=\left(\frac{25}{49}+\frac{25}{49}\right)\times\frac{41}{25}\)
\(=\frac{50}{49}\times\frac{41}{25}\)
\(=\frac{2050}{1225}\)
bài 1
a, 432 x 25 + 46 x 432 - 432
= 432 x ( 25 + 46 - 1)
=432 x 70
=30 240
b, 432 : 6 - 232 : 6 + 102 : 6
=(432 - 232 +102) : 6
=302:6
=50,333333333333..................
bài 2
a, 285 * x + 115 * x = 400
(285 + 115) * x = 400
400 * x = 400
x = 400 : 400
x = 1
b, x - 6 : 2 - (48 - 24 x 2 : 6 - 3) = 0
x - 3 - (48 - 48 : 6 - 3) = 0
x - 3 - ( 48 - 8 - 3) = 0
x - 3 - 37 = 0
x - 3 = 0 + 37
x - 3 =37
x = 37 + 3
x = 40
a) 432x25+46x432-432
=10800+19872-432
=30240
ban oi cau b sai đề hay gì đó
a) \(=23\left(64+37-1\right)=23.100=2300\)
ý b bn ghi rõ lại đầu bài đc ko ạ
a) ko ghi lại đề
\(=23.\left(64+37\right)-23\)
\(=2300-23\)
\(=2277\)