B=5/18*21+5/21*24+5/24*27+...+5/123*126
3/5B=3/5(5/18*21+5/21*24+...+5/123*126)
3/5B=3/5*5/18*21+3/5*5/21*24+...+3/5*5/123*126
3/5B=3/18*21+3/21*24+...+3/123*126
3/5B=1/18-1/21+1/21-1/24+...+1/123-1/126
3/5B=1/18-1/126
3/5B=126/2268-18/2268
3/5B=108/2268
3/5B=21
B=21÷3/5
B=21*5/3
B=35
Tìm x thuộc Z:biết:
a/ \(\dfrac{x+2}{27}\)=\(\dfrac{x}{-9}\)
b/\(\dfrac{-7}{x}\)=\(\dfrac{21}{34-x}\)
c/\(\dfrac{-8}{15}\)<\(\dfrac{x}{40}\)<\(\dfrac{-7}{15}\)
d/\(\dfrac{-1}{2}\)<\(\dfrac{x}{18}\)<\(-\dfrac{1}{3}\)
Bài 1:Tìm số,phân số tiếp theo trong dãy:
a)\(\dfrac{1}{3};\dfrac{1}{2};\dfrac{5}{9};\dfrac{7}{12};\dfrac{3}{5};.......\)
b)\(1;2;3;5;8;13;21;........;.........;........\)
c)\(1;1;1;1;4;7;13;.........;..........;.........\)
Các bạn giúp mình với ạ
Mình xin cám ơn rất rất nhiều
Tìm x:
a) 4,5 - 2x . 147 =1114
b) (x+ 14 −13 ): (2+16 −14 )=746
c)\(\dfrac{13}{15}-\left(\dfrac{13}{21}+x\right).\dfrac{7}{12}=\dfrac{7}{10}\)
So sánh tổng gồm 1006 số hạng :
\(S=\dfrac{1}{1\cdot1\cdot3}+\dfrac{1}{2\cdot3\cdot5}+...+\dfrac{1}{1006\cdot2011\cdot2013}\)
Tìm x thuộc N,biết:
\(\dfrac{1}{2}\)+\(\dfrac{1}{3}\)+\(\dfrac{1}{6}\)< bằng x < bằng \(\dfrac{13}{4}\)+\(\dfrac{14}{8}\)
TÌM SỐ TỰ NHIÊN X,BIẾT:
(\(\dfrac{1}{1.2.3}\)+\(\dfrac{1}{2.3.4}\)+................+\(\dfrac{1}{8.9.10}\))-x=\(\dfrac{23}{45}\)
THỰC HIỆN PHÉP TÍNH SAU:
a/\(\dfrac{1}{1.2}\)+\(\dfrac{1}{2.3}\)+\(\dfrac{1}{3.4}\)+...........+\(\dfrac{1}{99.100}\)
b/\(\dfrac{5.4^{15}-9^9-4.3^{10}.8^9}{5.29-6^{19}.7.2^{29}.27^6}\)
A= \((1+\dfrac{1}{1.3})(1+\dfrac{1}{2.4})......(1+\dfrac{1}{2014.2016})\)
Tìm a,b sao cho:
\(\dfrac{1}{a}\)+\(\dfrac{b}{8}\)=\(\dfrac{1}{2}\)
