Tính nHANH:
56785 -19998
Tính nhanh :
A, 1582 -99 B, 56785 - 19998
4596-298 40725 - 29999
6789-998 87257-7258
A, B,
1582 - 99 = 1483 56785 - 19998 = 36787
4596 - 298 = 4298 40725 - 29999 = 10726
6789 - 998 = 5791 87257 - 7258 = 79999
mk nha
A, 1582 - 99 = 1483 B, 56785 - 19998 = 36787
4596 - 298 = 4298 40725 - 29999 = 10726
6789 - 998 = 5791 87257 - 7258 = 79999
NEU DUNG THI LINK CHO MINH NHE ! CHUC BAN MAY MAN .
A,1582-99=1483 B,56785-19998=36787
4596-298=4298 40725-29999=10726
6789-998=5791 87257-7258=79999
1: tìm x :
500-x + 50=250
1/2 . x +70 =71
2 : hãy thay mỗi chữ bằng 1 chữ số thích hợp để có phép tính đúng bdce+bdae=accbe
3) a) 1582-99
b) (6324+5520) : 12
c) 56785-19998
Tính nhanh : a)1582-99. 4596-298. 6789-998. b)56785-19998. 40725-29995. 87257-7558. c)1800:5. 36600:60. 36600:50. 220000:5000. d)(6324+5220):12. (2004+1992):6
Tính nhanh
A=6+16+30+48+...+19600+19998
B=2+5+9+14+...+4949+5049
C=1.2.3+2.3.4+3.4.5+...+98.99.100
A=6+16+30+48+...+19600+19998
2A = 1.3+2.4+3.5+...+99.101
B=2+5+9+14+...+4949+5049
2A = 1.4+2.5+3.6+...+99.102
C=1.2.3+2.3.4+3.4.5+...+98.99.100
4A = 1.2.3.4+2.3.4(5-1)+3.4.5.(6-2)+...+98.99.100.(101-97)
4A = 1.2.3.4+2.3.4.5-1.2.3.4+3.4.5.6-2.3.4.5+...+98.99.100.101-97.98.99.100
4A = 98.99.100.101
A=6+16+30+48+...+19600+19998
A : 2 = 3 + 8 + 15 + 24 + . . . + 9800 + 9999
A : 2 = 1.3 + 2.4 + 3.5 + 4.6 + . . . + 98.100 + 99.101
A : 2 = 1.[1+2] + 2.[1+3] + 3.[1+4] + 4.[1+5] + . . . + 98.[1+99] + 99.[1+100]
A : 2 = 1 + 1.2 + 2 + 2.3 + 3 + 3.4 + 4 + 4.5 + . . . + 98 + 98.99 + 99 + 99.100
A : 2 = 1 + 2 + 3 + 4 + . . . + 199 + 1.2 + 2.3 + 3.4 + 4.5 + . . . + 98.99 + 99.100
A : 2 = 4950 + 333300
A = 676500
tính 6+16+30+48+...+19998
3181/. 6+16+30+48+...+19600+19998
Đặt B
B = 6 + 16 + 30 + 48 +...+ 19600 + 19998
Chia cả 2 vế cho 2 ta được
B/2 = 3 + 8 + 15 + 24 + ......... + 98000+ 9999
B/2= 1x3+2x4+3x5+4x6+…….+98x100+99x101
B/2= 100/6[(100-1)x(2x100+1)] = 328350
=> B =328350x2=656700
Tính s = 6 + 16 + 30 +48 + ... +19600 +19998
333333 + 56785 x 5 x 6 = ?
Tính :
C = 6 + 16 + 30 + 48 + ........... + 19600 + 19998
Tính tổng :S=1+3+6+10+15+......+19600+19998