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( 1+3+5+7+…+2003+2005) x (125 125 x 127 – 127 127 x 125)
= ( 1+3+5+7+…+2003+2005) x (125 x 1001 x 127 – 127 x 1001x 125)
= ( 1+3+5+7+…+2003+2005) x 0 = 0
Vì 125 125x127 – 127 127x125 = 1001x125x127 – 1001x127x125 = 0
nên : (1+3+5+...+2005)(125 125x127 – 127 127x125) = 0
bài 1 : 0
bài 2 : ( 8.78 + 1.25 ) x y= 26.3
10.03 x y = 26.3
y = 26.3 : 10.03
y = 2630/1003
bài 3 :diện tích HTG ABC là :
12 x 18 : 2 = 108 ( cm2 )
quên rùi
Đề bài có lẽ sai thừa số thứ hai phải là 125125x127-127127x125
Khi đó thừa số thứ hai sẽ là
125x1001x127-127x1001x125=0
Tích trên sẽ bằng 0
(1+3+5+7+...+2003+2005)×(125125×127-127127×125)
=(1+3+5+7+...+2003+2005)×0
=0
Ủng hộ nhé
( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 125125 x127 - 127127 x 125
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 125 x 1001 x 127 ) - ( 127 x 1001 x 125 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 0
= 0
( 1 + 3 + 5 + 7 +... + 2003 + 2005 ) x ( 125125 x 127 - 127127 x 125 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 125 x 1001 x 127 - 127 x 1001 x 125 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 0
= 0
~ Thiên Mã ~
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1. (1 + 3 + 5 + ... + 2005) . ( 125125.127 - 127127.125)
Ta có 125125.127 - 127127.125
=125.1001.127 - 127.1001.125
=0
=> (1 + 3 + 5 + ... + 2005) . ( 125125.127 - 127127.125)
= (1 +3 + 5 +...+ 2005) . 0
=0
Bài 1:
\(\left(1+3+5+...+2005\right)\cdot\left(125125.127-127127.125\right).\)
\(=\left(1+3+5+...+2005\right)\left(125.1001.127-127127.125\right).\)
\(=\left(1+3+5+...+2005\right)\left(125.127127-127127.125\right).\)
\(=\left(1+3+5+...+2005\right).0=0.\)
Vậy.....
Bài 2:
\(\left(7.13+8.13\right):\left(\dfrac{29}{3}-x\right)=39.\)
\(\left[\left(7+8\right)13\right]:\left(\dfrac{29}{3}-x\right)=39.\)
\(\left[15.13\right]:\left(\dfrac{29}{3}-x\right)=39.\)
\(195:\left(\dfrac{29}{3}-x\right)=39.\)
\(\dfrac{29}{3}-x=195:39.\)
\(\dfrac{29}{3}-x=5.\)
\(\Rightarrow x=\dfrac{29}{3}-5.\)
\(\Rightarrow x=\dfrac{29}{3}-\dfrac{15}{3}=\dfrac{14}{3}.\)
Vậy.....
~ Hok tốt!!! ~
a. Vì 125 125x127 – 127 127x125 = 1001x125x127 – 1001x127x125 = 0
nên : (1+3+5+...+2005)(125 125x127 – 127 127x125) = 0
b.
19 , 8 : 0 , 2 x 44 , 44 x 2 x 13 , 2 : 0 , 25 3 , 3 x 88 , 88 : 0 , 5 x 6 , 6 : 0 , 125 x 5 = 19 , 8 x 5 x 88 , 88 x 13 , 2 x 4 3 , 3 x 88 , 88 x 2 x 6 , 6 x 8 x 5 = 19 , 8 x 5 x 88 , 88 x 13 , 2 x 4 3 , 3 x 88 , 88 x 13 , 2 x 4 x 2 x 5 = 19 , 8 3 , 3 x 2 = 3
Dài thế