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a) 153+1980:36-18x11
=153+55-198
=10
b) 174x (23+7896:168)
=174x (23+47)
=174x 70
=12180
\(\frac{9\times11\times36}{33\times27\times18}=\frac{1\times1\times2}{3\times3\times1}=\frac{2}{9}\)
\(\frac{9\cdot11\cdot36}{33\cdot27\cdot18}=\frac{9\cdot11\cdot2\cdot18}{3\cdot11\cdot3\cdot9\cdot18}=\frac{2}{9}\)
Chu'c hok to^'t nha!
c.từ 7 đến 43 có:(43-7):4+1=10(số)
từ 7 đến 43 có 10 số=>có 10 số X
[X+7]+[X+11]+[X+15]+...+[X+43]=1980
X*10+(7+11+15+...+43)=1980
X*10+250=1980
X*10=1980-250
X*10=1730
X=1730:10
X=173
=9/4x2/3+16/9x4/3
=18/12+64/36
=54/36+64/36=118/36=59/18
TL:
8/15 x 5/6 = 40/90 = 4/9
41/20 x 3/4 = 123/80
(11/23 + 9/23) + (18/23 + 2/23) = 20/23 + 20/23 = 40/43
HT
\(\left(\frac{2}{3}\times\frac{4}{5}\right)\times\frac{5}{6}\) = \(\frac{2}{3}\times\frac{4}{5}\times\frac{5}{6}\)=\(\frac{2\times4\times5}{3\times5\times6}\)=\(\frac{2\times4\times5}{3\times5\times2\times3}\)=\(\frac{4}{9}\)
\(\frac{11}{23}+\frac{2}{23}+\frac{9}{23}+\frac{18}{23}\)=\(\frac{\left(11+9\right)+\left(18+2\right)}{23}\)=\(\frac{20+20}{23}\)=\(\frac{40}{23}\)
\(\frac{27}{12}+\frac{17}{6}-\frac{25}{36}-\frac{15}{6}\)=\(\left(\frac{27}{12}-\frac{25}{36}\right)+\left(\frac{17}{6}-\frac{15}{6}\right)\)=\(\frac{14}{9}+\frac{2}{6}\)=\(\frac{17}{9}\)
/HT\
36/11 x 22/17 x 51/72
= 36 x 22 x 51/11 x 17 x 72
= 36 x 2 x 11 x 17 x 3/11 x 17 x 36 x 2
= 3
22/16 x 64/55 x 27/13
= 22 x 64 x 27/16 x 55 x 13
=2 x 11 x 16 x 4 x 27/16 x 5 x 11 x 13
= 216/65
36 x 48/12 x 24 + 18 x 104/36 x 4
= 12 x 3 x 2 x 24/12 x 24 + 18 x 13 x 2 x 4/ 18 x 2 x 4
= 6 + 13
= 19
=
=10 nha
10