So sánh:
A=123456.123457-123455.123458
B=987654.987655-987653.987656
K
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NH
3
TH
29 tháng 6 2015
A=123456.123457-123455.123458=(123455+1).123457-123455(123457+1)=123455.123457+123457-123455.123457-123455=2
B=987654.987655-987653.987656=(987653+1).987655-987653.(987655+1)=987653.987655+987655-987653.987655-987653=2
=> A=B
DN
1
NN
17 tháng 8 2017
Đặt 123456=x và 987654=y. Theo bài ra , ta có:
-A= x(x+1)-(x-1)(x+2)=(x\(^2\)+x)-(x\(^2\)+2x-x-2)=x\(^2\)+x-x\(^2\)-2x+x+2=2.
-B=y(y+1)-(y-1)(x+2)=(y\(^2\)+y)-(y\(^2\)+2y-y-2)=y\(^2\)+y-y\(^2\)-2y+y+2=2.
\(\Rightarrow\)A=B.
Thấy đúng thì tick cho m nha
XO
8 tháng 6 2020
Ta có A = 123456.123457 - 123455.123458
= (123455 + 1).123457 - 123455.123458
= 123455.123457 - 123455.123458 + 123457
= 123455(123457 - 123458) + 123457
= 123455.(-1) + 123457
= 2
Lại có B = 987654.987655 - 987653.987656
= (987653 + 1).987655 - 987653.987656
= 987653.987655 - 987653.987656 + 987655
= 987653.(987655 - 987656) + 987655
= 987653.(-1) + 987655 = 2
=> A = B (CÙNG = 2)
NA
0
DT
Dang Tung
CTVHS
14 tháng 6 2023
\(\dfrac{11}{-13}=-\dfrac{11}{13}=-\dfrac{13}{13}+\dfrac{2}{13}=-1+\dfrac{2}{13}\\ -\dfrac{14}{15}=-\dfrac{15}{15}+\dfrac{1}{15}=-1+\dfrac{1}{15}\)
Ta thấy : \(\dfrac{1}{15}< \dfrac{1}{13}< \dfrac{2}{13}=>-1+\dfrac{1}{15}< -1+\dfrac{2}{13}\)
hay \(\dfrac{11}{-13}>-\dfrac{14}{15}\)
14 tháng 12 2016
Tớ thấy : A = 1005 x 1005 = 1010025
B = 1000 x 1010 = 1010000
Vậy A > B
14 tháng 12 2016
A = 1005x1005 = (1000+5)x(1010-5) =1000x1010 x 5x1010 - 5x1000 - 25 = 1000x1010 - 25 = B - 25
Vậy B > A
NT
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1
18 tháng 10 2021
a: \(11^{14}< 11^{15}\)
b: \(4^{300}=64^{100}\)
\(3^{400}=81^{100}\)
mà 64<81
nên \(4^{300}< 3^{400}\)
NN
14 tháng 9 2021
a, Có 3 = (3
)
= 9
và 2
= (2
)
= 8
=> 3
> 2
b, Có 6 = (6
)
= 36
=> 6
> 12
26 tháng 1 2023
37,37 x 5959,59 = 37 x 1,01 x 59 x 101,01 = 37 x 59 x 1,01 x 101,01
59,59 x 3737,37 = 59 x 1,01 x 37 x 101,01 = 37 x 59 x 1,01 x 101,01
=> 37,37 x 5959,59 = 59,59 x 3737,37
Kick mik nha
Ta tính A = 123 456 . 123 457 - 123 455 . 123 458
= ( 123 455 + 1 ) . 123 457 - 123 455 . ( 123 457 + 1 )
= 123 457 . 123 455 + 123 457 - 123 455 . 123 457 + 123 455
= 0
Ta tính B = 987 654 . 987 655 - 987 653 . 987 656
= ( 987 653 + 1 ) . 987 655 - 987 653 . ( 987 655 + 1 )
= 987 655 . 987 653 + 987 655 - 987 653 . 987 655 + 987 653
= 0
Vậy A = B