Các câu hỏi tương tự
1. Tính nhanh:
a) 7/12 . 6/11 + 7/12 . 5/11 - \(2\frac{7}{12}\)
b) -5/9 . -6/13 + 5/-9 . -5/13 - 5/9
c) 0,8 . -15/14 - 4/5 . 13/14 - \(1\frac{2}{5}\)
d) -75% . 6/7 + 5% . 6/7 + 7/10 . \(1\frac{1}{7}\)
Mọi người giúp em với ạ🥺 Em cảm ơn nhoéee:3
Tính nhanh \(A=\frac{1+2^3+2^6+...+2^{81}+2^{84}+2^{87}}{1+2^5+2^{10}+...+2^{75}+2^{80}+2^{85}}\)
tính giá trị của biểu thức
a,\(-\frac{1}{2}+\frac{5}{6}-3,12+5,1\)
b,\(30+2,8:\left(\frac{4}{25}-\frac{9}{5}-\frac{1}{6}\right)\)
c,\(\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right)\times230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{7}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
Tinh:
A=-5,13:\(\left(5\frac{5}{28}-1\frac{8}{9}.1,25+1\frac{16}{63}\right)\)
B=\(\left(3\frac{1}{3}.1,9+19,5:4\frac{1}{3}\right)\).\(\left(\frac{62}{75}-\frac{4}{25}\right)\)
giup mik voi
B= 1/5 - 1/9 + 1/13 / 9/5 -1 + 9/13 + 10/7-10/11-10/17 / 12/7 - 12 /11 - 12/17
C=1/14 - 1/30 - 1/46 / 2/35 - 2/75 - 2/115 : 3/8 - 15/17 + 30/31 / 1/6 - 20/51 + 40/93
D= 1/100.99 - 1/99.98 - 1/98.97 - ........... - 1/3.2 - 1/2.1
E= ( 1+2+3+.......+100) . ( 1/3-1/5-1/7-1/9) . ( 6,3 .12 - 21 .3,6) / 1/2+1/3+1/4+..........+ 1/100
tinh nhanh
1/2.1/-3+1/-3.1/4+1/4.1/-5+1/-5.1/6
(4-1/4+2/3)+(5+4/3-6/5)-(6-7/4+4/5) tinh nhanh
tính nhanh
1/2*3 + 1/6*5 + 1/10*7 + 1/14*9+..+ 1/198*101
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