Theo hằng đẳng thức số 3
Hiệu hai bình phương
=> (P-1).(P+1) = P2 -1
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Các câu hỏi tương tự
hãy điền dấu +,- thích hợp1...1...1...1...1...1...1...1...1...1101...1...1...1...1...1...1...1...1...191...1...1...1...1...1...1...1...1...181...1...1...1...1...1...1...1...1...171...1...1...1...1...1...1...1...1...161...1...1...1...1...1...1...1...1...151...1...1...1...1...1...1...1...1...141...1...1...1...1...1...1...1...1...131...1...1...1...1...1...1...1...1...121...1...1...1...1...1...1...1...1...111...1...1...1...1...1...1...1...1...10
Đọc tiếp
hãy điền dấu +,- thích hợp
1...1...1...1...1...1...1...1...1...1=10
1...1...1...1...1...1...1...1...1...1=9
1...1...1...1...1...1...1...1...1...1=8
1...1...1...1...1...1...1...1...1...1=7
1...1...1...1...1...1...1...1...1...1=6
1...1...1...1...1...1...1...1...1...1=5
1...1...1...1...1...1...1...1...1...1=4
1...1...1...1...1...1...1...1...1...1=3
1...1...1...1...1...1...1...1...1...1=2
1...1...1...1...1...1...1...1...1...1=1
1...1...1...1...1...1...1...1...1...1=0
tính nhanh
1+1+11+11+1+1+1+1+1+1+1+1+1+111+1+1+1+1+1+1+1+1+1+1111+1+1+1+11+1+1+1+1+1+1+1+1+1+1=?
1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+1-1+...1+1-1+1-1+1=1
T & F
Bài 1:
a, -1/2 . (x + 1/3) = -1/4
b, 3/8 : (1/3 - x) = -17/40
Bài 2:
(1 - 1/4) . (1 - 1/9) . (1 - 1/16) . (1 - 1/25) . (1 - 1/36) . ( 1 - 1/49) . (1 - 1/64) . ( 1 - 1/81) . ( 1 - 1/100)
Cứu tui với, tối nay tui phải nộp BTVN rùi
B1
a (1/2+1).(1/3+1).(1/4+1)...(1/99+1)
b (1/2-1).(1/3-1).(1/4-1)...(1/100-1)
c 3/2^2.8/3^3.15/4^4...899/30^2
d(1-1/2).(1-1/3).(1-1/4)...1-1/1999).(1-1/200)
tính
1 /1/2 x 1 1/3 x 1/4 ....1 1/2017
[ 1 - 1/5 ] x [ 1 - 1/6 ] x [ 1 - 1/7 ] x [ 1 -1/8 ] x [ 1 - 1/9 ]
1 1/3 x 1 1/8 x 1 1/15 ....1 1/9800
tính:
A=1+!/2+1/2^2+...+1/2^100
B=1+1/3+1/3^2+...=1/3^100
C=(1+1/2)+(1+1/3)=...=(1+1/2018)
D=(1-1/2).(1-1/3)...(1-1/2018)
tính tổng 100 só đầu tiên
a)1/3 ; 1/15 ; 1/35;...
b) 1/2.4; 1/ 4.6 ; 1/6.8;..
2
a )Tìm tích 30 số dầu tiên
1 và 1/3; 1 và1/8 ;1 và 1/ 15 ; 1vaf 1/24 ; 1 và 1/35
b) rút gọn
a= ( 1 -1/3).(1 -1/6).(1 -1/9).(1 -1/15)....( 1 -1/190)
Thực hiện các phép tính
B,
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256
C,
1/1x2 + 1/2x3 + 1/3x4 + ........ + 1/99x100
D,
( 1-1/2 ) x ( 1- 1/3 ) x ( 1-1/4 ) x ....... x ( 1- 1/100 )
1/1.7+1/7.13+1/13.19+......+1/61.67
1/1.2.3+1/2.3.4+1/3.4.5+.......+1/8.9.10
1/1+2 + 1/1+2+3 + 1/1+2+3+4 +.......+ 1/1+2+3+....+99
CẦN GẤP