a) \(\dfrac{11\cdot8-11\cdot3}{17-6}\)
\(=\dfrac{11\cdot\left(8-3\right)}{11}=5\)
b) \(\dfrac{24-12\cdot13}{12+4\cdot9}\)
\(=\dfrac{12\cdot\left(2-13\right)}{12\left(1+3\right)}=\dfrac{-11}{4}\)
rút gọn các phân số
-33/88 11.8-11.3/17-6 7/9.10^2-2.10^2
rút gọn về phân số tối giản:
a, \(\dfrac{-147}{252}\) b,\(\dfrac{765}{900}\) c, \(\dfrac{11.3-11.8}{17-6}\) d,\(\dfrac{3^5.2^4}{8.3^6}\) e, \(\dfrac{84.45}{49.54}\)
Rút gọn các phân số sau:
a)\(\dfrac{13.9-13.2}{25-12}\) b) \(\dfrac{42-14.8}{7+21.3}\)
c)\(\dfrac{9.6-18.4}{12.3}\)
d)\(\dfrac{5.5^2}{9.10^2-4.10^2}\)
Rút gọn các phân số sau
a ) 11.8 − 11.3 17 − 6 ; b ) 24 − 12.13 12 + 4.9 ; c ) 7.6 − 7.4 7.3
d ) 7 9.10 2 − 2.10 2 ; e ) ( − 7 ) .3 + 4. ( − 6 ) ( − 5 ) .3 + 2.3 ; f ) ( − 17 ) .13 + 17.2 11.2 − 11.19
Rút gọn:
3.7.8.13/14.15.26
11.8-11.3/17-6
-17.13+17.2/11.2-11.9
7/9.10^2-2.10^2
7.4^5.3^11+3^13.9^5/6^10+2^12.3^10
2.4+2.4.8+4.8.16+8.16.32/3.4+2.6.8+4.12.16+8.24.32
Rút gọn phân số
(-17).13+17.2 / 1.2-11.19
24-12.13 / 12+4.9
-5.4+8.(-7) / (-12).5+7.4
rút gọn các phân số sau
\(\dfrac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)
\(\dfrac{2^2.2^3.5^7}{2^3.3^4.5^6}\)
rút gọn các phân số sau:
a) \(\dfrac{22}{55}=\) b) \(\dfrac{-63}{81}=\)
c)\(\dfrac{2.14}{7.8}=\) d)\(\dfrac{49+7.49}{49}=\)
Bài 6: Tính các tổng sau:
A= \(\dfrac{7}{10.11}\)+\(\dfrac{7}{11.12}\)+\(\dfrac{7}{12.13}\)+...+\(\dfrac{7}{69.70}\)
B= \(\dfrac{1}{25.27}\)+\(\dfrac{1}{27.29}\)+\(\dfrac{1}{29.31}\)+...+\(\dfrac{1}{73.75}\)
