4\5x16\9-7\9x4\5-4\5
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BT
2
28 tháng 6 2018
a, \(\dfrac{38}{7}\) + ( \(\dfrac{16}{7}\) - \(\dfrac{5}{3}\))
= \(\dfrac{38}{7}\) + \(\dfrac{16}{7}\) - \(\dfrac{5}{3}\)
= \(\dfrac{54}{7}\) - \(\dfrac{5}{3}\)
= \(\dfrac{162}{21}\) - \(\dfrac{35}{21}\)
= \(\dfrac{127}{21}\)
b, \(\dfrac{29}{9}\) - ( \(\dfrac{14}{9}\) + \(\dfrac{11}{9}\) )
= \(\dfrac{29-14-11}{9}\)
= \(\dfrac{4}{9}\)
c, ( \(\dfrac{2}{7}\) + \(\dfrac{3}{8}\) + \(\dfrac{12}{7}\) + \(\dfrac{5}{8}\) ) - \(\dfrac{19}{63}\)
= ( \(\dfrac{2+12}{7}\) + \(\dfrac{3+5}{8}\)) - \(\dfrac{19}{63}\)
= \(\left(1+2\right)\) - \(\dfrac{19}{63}\)
= \(3-\dfrac{19}{63}\)
= \(\dfrac{189}{63}\) - \(\dfrac{19}{63}\)
= \(\dfrac{170}{63}\)
d, \(\dfrac{3}{7}\) . \(\dfrac{4}{9}\) + \(\dfrac{4}{9}\) . \(\dfrac{4}{7}\) - \(\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) . ( \(\dfrac{3}{7}\) + \(\dfrac{3}{7}\) ) - \(\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) . \(1-\dfrac{4}{9}\)
= \(\dfrac{4}{9}\) - \(\dfrac{4}{9}\)
= 0
1 tháng 4 2016
Số cần tìm là:
1+2+3+4+5+6+7+8+9x4:2+99+1=163
Đs:163
đung 100%
24 tháng 4 2021
a) \(1678\cdot24+77\cdot1678-1678=1678\left(24+77-1\right)=167800\)
24 tháng 4 2021
b) Ta có: \(\dfrac{2}{5}+\dfrac{4}{11}+\dfrac{3}{5}+\dfrac{18}{11}+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=\left(\dfrac{2}{5}+\dfrac{3}{5}\right)+\left(\dfrac{4}{11}+\dfrac{18}{11}\right)+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=3+\dfrac{1}{4}+\dfrac{1}{6}\)
\(=\dfrac{36}{12}+\dfrac{3}{12}+\dfrac{2}{12}=\dfrac{41}{12}\)
22 tháng 7 2021
2) 9x2+ 12x+ 4
<=>(3x)2+ 2.3x.2+ 22 <=>(3x+ 2)2
3) 4x4+ 20x2+ 25
<=>(2x2)2+ 2.2x2.5+ 52 <=>(2x2+5)2
4) 25x2- 20xy+ 4y2
<=> (5x)2- 2.5x.2y+ (2y)2<=> (5x-2y)2
5) 9x4- 12x2y+ 4y2
<=> (3x2)2- 2.3x2.2.y+ (2y)2<=> (3x2- 2y)2
6) 4x4- 16x2y3+ 16y6
<=> (2x2)2- 2.2x2.4y3+ (4y3)2<=> (2x2- 4y3)2
7) 9x4- 12x5+ 4x6
<=> (3x2)2- 2.3x2.2x3+ (2x3)2<=> (3x2- 2x3)2
PD
3
30 tháng 7 2016
\(\frac{4}{9}\cdot\frac{11}{15}+\frac{4}{9}\cdot\frac{4}{15}\)
\(=\frac{4}{9}\left(\frac{11}{15}+\frac{4}{15}\right)\)
\(=\frac{4}{9}\cdot1=\frac{4}{9}\)
30 tháng 7 2016
\(\left(x-\frac{2}{3}\right).\frac{1}{6}=\frac{1}{8}\)
\(\left(x-\frac{2}{3}\right)=\frac{3}{4}\)
\(x=\frac{17}{12}\)
15 tháng 2 2017
\(\frac{5}{9}x\frac{4}{7}+\frac{5}{9}x\frac{3}{7}\)
\(=\frac{5}{9}x\left(\frac{4}{7}+\frac{3}{7}\right)\)
\(=\frac{5}{9}x1\)
\(=\frac{5}{9}\)
7 tháng 4 2022
a: =2/3(4/9+5/9)=2/3
d: =15/16(9/5-4/5)=15/16
e: =13/25(5-3-1)=13/25
\(\dfrac{4}{5}\times\dfrac{16}{9}-\dfrac{7}{9}\times\dfrac{4}{5}-\dfrac{4}{5}\)
\(=\dfrac{4}{5}\times\left(\dfrac{16}{9}-\dfrac{7}{9}-1\right)\)
\(=\dfrac{4}{5}\times0\)
\(=0\)
#Đang Bận Thở
4/5 x 16/9 - 7/9 x 4/5 - 4/5
= 4/5 x ( 16/9 - 7/9 - 1 )
= 4/5 x 0 = 0