Các câu hỏi tương tự
c)C=\(\frac{2}{1.2}\)+\(\frac{4}{2.4}\)+\(\frac{6}{4.7}\)+\(\frac{8}{7.11}\)+\(\frac{10}{11.16}\)+\(\frac{12}{16.22}\)
1/2+2/2.4+3/4.7+...+9899/9900
Tính giá trị biểu thức :a,A=1.3+3.5+5.7+......+49.51
b, B=2.4+4.6+6.8+.....+48.50
c,C=1.3+2.4+3.5+4.6+......+10.12+11.13+12.14
d,D=1.4+4.7+7.10+....+46.49
giúp mình với ai nhanh mình tick cho
Bài 1 Tính giá trị biểu thức :
A = 3/1.4 + 5/4.9 + 7/9.16 + 9/16.25 + 11/25.36
B = 3/1.4 + 3/4.7 + ... + 3/100.103
C = 3/1.4 + 6/4.10 + 9/10.19 + 12/19.31 + 15/31.46 + 18/46.64
Bài 2 Chứng minh rằng :
1/1.2 + 1/3.4 + 1/5.6 + ... + 1/49.50 = 1/26 + 1/27 + 1/28 + ... + 1/50
Tính nhanh
\(\frac{1.2+2.4+3.6+4.8+5.10}{3.4+6.8+9.12+12.16+15.20}\)
bài 2 tính tổng
A=\(\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+.....+\frac{1}{48.50}\)
B=\(\frac{3}{1.4}+\frac{3}{4.7}+......+\frac{3}{97.100}\)
C=\(\frac{8}{7.14}+\frac{8}{14.21}+......+\frac{8}{91.98}\)
giúp mk vs mk đang cần lắm
Tính:
a) dfrac{1}{1.2} + dfrac{1}{2.3} + dfrac{1}{3.4} +...+ dfrac{1}{1999.2000}
b) dfrac{1}{1.4} + dfrac{1}{4.7} + dfrac{1}{7.10} +...+ dfrac{1}{100+103}
c) dfrac{8}{9} - dfrac{1}{72} - dfrac{1}{56} - dfrac{1}{42} -...-dfrac{1}{6} - dfrac{1}{2}
Đọc tiếp
Tính:
a) \(\dfrac{1}{1.2}\) + \(\dfrac{1}{2.3}\) + \(\dfrac{1}{3.4}\) +...+ \(\dfrac{1}{1999.2000}\)
b) \(\dfrac{1}{1.4}\) + \(\dfrac{1}{4.7}\) + \(\dfrac{1}{7.10}\) +...+ \(\dfrac{1}{100+103}\)
c) \(\dfrac{8}{9}\) - \(\dfrac{1}{72}\) - \(\dfrac{1}{56}\) - \(\dfrac{1}{42}\) -...-\(\dfrac{1}{6}\) - \(\dfrac{1}{2}\)
-12:(3/4-5/6)^2
7/23.((-8/6)-45/18)
23/1/4.7/5-13/1/4:5/7
(1+2/3-1/4)(0,8-3/4)
16/2/7:(-3/5)+28/2/7:3/5
Tính nhanh
A)-3/7+5/13-4/7+8/13
B)-5/14-2/-14+1/8+1/8
C)-5/13-(3/5+3/13-4/10)
D)[1/8-9/7+4/6-12/7-1/2)+5/9]