1x2x3x4x5...x101/3x4x5x6...x100
1x2x3x4x5x...x101/3x4x5x6...x100
Giai giúp mình bài này bằng cách tính nhanh nhé
Cảm ơn mn
A = \(\dfrac{1\times2\times3\times4\times5\times6\times....\times100\times101}{3\times4\times5\times6\times.......\times100}\)
A = 1 x 2 x 101 x \(\dfrac{3\times4\times5\times6\times........\times100}{3\times4\times5\times6.............\times100}\)
A = 1 x 2 x 101 x 1
A = 202
\(\dfrac{1.2.3.4.5....101}{3.4.5.6.100}\)
Ta thấy phần tử sẽ triệt tiêu hết cho mẫu nên mẫu sẽ bằng 1
=> \(\dfrac{2.101}{2}=202\)
Cho các số tự nhiên x1,x2,..,x101x1,x2,..,x101 thỏa mãn x1+x2+x3+x4+...+x99+x100+x101=0x1+x2+x3+x4+...+x99+x100+x101=0 và x1+x2=x3+x4=...=x97+x98=x99+x100=x100+x101=1.x1+x2=x3+x4=...=x97+x98=x99+x100=x100+x101=1. Số nguyên x100x100 bằng bao nhiêu ?
cho x1,x2,x3,......,x100, x101
biết x+x2+x3+...........+x100+x101=0và x1+x2=x3+x4=.................=x99+x100=x100+x101
giúp mình với
Giải các bất phương trình sau:
a) 3 x + 1 2 + 3 x + 3 3 > 3 x + 5 4 + 3 x + 7 5
b) 3 − x 100 + 4 − x 101 > 10 − 2 x 204 + 12 − 2 x 206
1x2x3x4+2x3x4x5+3x4x5x6+...97x98x99x100
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A = 1x2x3x4 - 2x3x4x5 + 3x4x5x6 - 4x5x6x7 +...+ 2525x2526x2527x2528?
Tính A = 1x2x3x4 - 2x3x4x5 + 3x4x5x6 - 4x5x6x7 +...+ 2525x2526x2527x2528
Tính A = 1x2x3x4 - 2x3x4x5 + 3x4x5x6 - 4x5x6x7 +...+ 2525x2526x2527x2528
Tính A = 1x2x3x4 - 2x3x4x5 + 3x4x5x6 - 4x5x6x7 +...+ 2525x2526x2527x2528