calculate : [ 247 * 315 + 246 * 314 ] * [ 98 * 47 - 94 * 49 ] = ...........
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 247 x 315 + 246 x 314 ) x ( 98 x 47 - 94 x 49 )
= ( 247 x 315 + 246 x 314 ) x ( 4606 - 4606 )
= ( 247 x 315 + 246 x 314 ) x 0
= 0
(247 x 315 + 246 x 314) x (98 x 47 - 94 x 49)
= (247 x 315 + 246 x 314) x (4606 - 4606)
= (247 x 315 + 246 x 314) x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
Đơn giản như đang giỡn :
=315.313.316.317/315.314.316.317
=313/314
hok tốt k nhé bạn .
\(\frac{315}{316}\cdot\frac{313}{314}\cdot\frac{316}{315}\cdot\frac{317}{314}\)
= \(\frac{315\cdot313\cdot316\cdot317}{316\cdot314\cdot315\cdot314}\)
=\(\frac{1\cdot313\cdot1\cdot317}{1\cdot314\cdot1\cdot314}\)(Bước này là bước rút gọn)
= \(\frac{99221}{98596}\)
#Kiều
![](https://rs.olm.vn/images/avt/0.png?1311)
ra kết quả thui nhé!
a/ 120
b/ -100
c/ 430
d/ -98
e/ A=-32
f/ B=1/10
tik nhá
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(A=\left(\dfrac{1}{99}+1\right)+\left(\dfrac{2}{98}+1\right)+...+\left(\dfrac{98}{2}+1\right)+1\)
\(=\dfrac{100}{99}+\dfrac{100}{98}+...+\dfrac{100}{2}+\dfrac{100}{100}\)
\(=100\cdot\left(\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{100}\right)\)=100B
=>B/A=1/100
b: \(A=\left(\dfrac{1}{49}+1\right)+\left(\dfrac{2}{48}+1\right)+\left(\dfrac{3}{47}+1\right)+...+\left(\dfrac{48}{2}+1\right)+\left(1\right)\)
\(=\dfrac{50}{49}+\dfrac{50}{48}+....+\dfrac{50}{2}+\dfrac{50}{50}\)
\(=50\left(\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{50}\right)\)
\(B=\dfrac{2}{2}+\dfrac{2}{3}+\dfrac{2}{4}+...+\dfrac{2}{49}+\dfrac{2}{50}\)
\(=2\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{49}+\dfrac{1}{50}\right)\)
=>A/B=25
![](https://rs.olm.vn/images/avt/0.png?1311)
B = 99 - 33 + 97 - 96 + 95 - 94 +...+49 - 48
B = (99 - 33 ) + ((97 - 96 ) + ( 95 - 94 ) + ...+( 49 - 48 ))
B = 33 + 25
B = 58
Vậy B = 58
![](https://rs.olm.vn/images/avt/0.png?1311)
47 x 98 + 94
= 47 x 98 + 47 x 2
= 47 x ( 98 + 2 )
= 47 x 100
= 4700
học tốt ^^
24719890
[247 x 315 + 246 x 314] x [98 x 47 - 94 x 49]
= [77805 + 77244] x [49 x 2 x 47 - 94 x 49]
= 155049 x [49 x 94 - 94 x 49]
= 155049 x [(49 - 49) x 94]
= 155049 x [0 x 94]
= 155049 x 0
= 0
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