1\(\frac{5}{7}\)= \(\frac{?}{?}\)
ai k minh minh k lai nhe
\(\frac{a;a+5}{25}=\frac{1}{5}\)
ai nhanh tay minh tich 5 lai cho nhe !
\(\frac{1254}{5}+\frac{54}{5}=????????????????????\)
tk minh minh k lai
1254/5+54/5=261,6
k mình nhé mình k cho !
Ai k cho Thanh Mai Cute thi noi cho minh de minh k lai nhe!
Nhớ là phải nói thật đấy!
nhin cai ten thi thay dep that nhung noi the chac cung cute
h nhe
mik nè, mik tk cho bn ấy 3 tk rồi
mk k cho cậu 3 cái rùi đó nhớ k lại nhak mk thích cậu
chứng minh rằng \(\frac{1}{7^2}-\frac{1}{7^4}+\frac{1}{7^6}-\frac{1}{7^8}+...+\frac{1}{7^{98}}-\frac{1}{7^{100}}<\frac{1}{50}\)
ai nhanh minh k cho
Đặt \(S=\frac{1}{7^2}-\frac{1}{7^4}+\frac{1}{7^6}-\frac{1}{7^8}+...+\frac{1}{7^{98}}-\frac{1}{7^{100}}\)
\(\Rightarrow7^2S=1-\frac{1}{7^2}+\frac{1}{7^4}-\frac{1}{7^6}+....+\frac{1}{7^{96}}-\frac{1}{7^{98}}\)
\(\Rightarrow49S=1-S-\frac{1}{7^{100}}\)
\(\Rightarrow49S+S=1-S-\frac{1}{7^{100}}+S\)
\(\Rightarrow50S=1-\frac{1}{7^{100}}<1\Rightarrow50S<1\Rightarrow S<\frac{1}{50}\left(đpcm\right)\)
minh moi hoc lop 4 nen ko bik lam thong cam nha ban
\(\frac{2}{3}+\frac{5}{4}=\)
Ai nhanh k nha...Ai k mình mình k lại cho nhe
\(\frac{2}{3}\) + \(\frac{5}{4}\)
= \(\frac{2.4}{3.4}\) + \(\frac{5.3}{4.3}\)
= \(\frac{8}{12}\) + \(\frac{15}{12}\)
= \(\frac{23}{12}\)
Đáp số : \(\frac{23}{12}\)
\(\frac{2}{3}+\frac{5}{4}=\frac{8}{12}+\frac{15}{12}=\frac{23}{12}\)
1+5=
ai k minh minh k lai
1 , \(c=\frac{10\frac{1}{3}.\left(26\frac{1}{3}-\frac{176}{7}\right)-\frac{12}{11}.\left(\frac{10}{3}-1,75\right)}{\frac{5}{\left(91-0,25\right).\frac{60}{11}-1}}\)
2 , \(A=\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,265+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
cac ban giai nhanh giup minh nha! ai nhanh minh k!
5^1x5^2=...
ai k minh minh k lai
51 x 52
= 5 x 1 x 5 x 5
= 5 x 5 x 5
= 125
Vậy : 51 x 52 = 125
75/5^2=
ai k minh minh k lai
\(\frac{75}{5^2}=\frac{75}{25}=75:25=3\)