\(5^3:5+4:\left(49-5\times3^2\right)=5^2+4:\left(49-5\times9\right)=25+4:\left(49-45\right)=25+4:4=25+1=26\)
5 5 5
_______ +_______+.....+_______
3×4 4×5 49×50
Câu 2:
a,-2/49-(5/3-2/49) b,C=5*4^15*9^9-4*3^20*8^9/5*2^9*6^19-7*2^29*27^6
Câu 2:
a,-2/49-(5/3-2/49) b,C=5*4^15*9^9-4*3^20*8^9/5*2^9*6^19-7*2^29*27^6
Tính nhanh:
\(\frac{5-\frac{5}{7}-\frac{5}{49}}{4-\frac{4}{7}-\frac{4}{49}}+\frac{1,5+75\%-\frac{3}{8}}{0,625-\frac{5}{2}-125\%}\)
2/35 : (3/5+3/7)
1,2 . 25/6 - (4/3+5/3)
5 5/7 - (3/7+2 3/5) : 4/5
1,4 . 15/49 - (4/5+2/3) : 2 1/5
tính các tổng sau
A=1*2+2*3+3*4+4*5+5*6+6*7...+49*50
B=1*50+2*49+3*48+...+49*2+50*1
20 : ( x - 5) = 4 . 25 - 20
( 4 + 3) ( x -5) + 14 = 25 + 124 : 4
49 . x - 14 .x = 49 . 10 - 70
so sánh giữa s và p biết
s=1/2+1/3+1/4+1/5+.............+1/49
p=1/49+2/48+3/47+4/46+5/45+...........+49/1
Tính: \(1+5+5^2+5^3+5^4+...+5^{49}+5^{50}\)
