\(\frac{20,2x5,1-30,3x3+14,58}{14,58x460+7,29x2x540}\)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\dfrac{20,2\times5,1-30,3\times3,4+14,58}{14,58\times460+7,29\times540\times2}\)
A = \(\dfrac{10,1\times2\times5,1-10,1\times3\times3,4+14,58}{14,5\times460+(7,29\times2)\times540}\)
A = \(\dfrac{10,1\times\left(2\times5,1-3\times3,4\right)+14,58}{14,58\times460+14,58\times540}\)
A = \(\dfrac{10,1\times\left(10,2-10,2\right)+14,58}{14,58\times\left(460+540\right)}\)
A = \(\dfrac{10,1\times0+14,58}{14,58\times1000}\)
A = \(\dfrac{14,58}{14,58\times1000}\)
A = \(\dfrac{1}{1000}\)
A = 0,001
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{20,2\times5,1-30,3\times3,4+14,58}{14,58\times460+7,29\times540\times2}\)
\(=\frac{10,1\times2\times5,1-10,1\times3\times3,4+14,58}{14,58\times460+14,58\times540}\)
\(=\frac{10,1\times\left(2\times5,1-3\times3,4\right)+14,58}{14,58\times\left(460+540\right)}\)
\(=\frac{10,1\times0+14,58}{14,58\times1000}\)
\(=\frac{14,58}{14580}\)\(=\frac{1458}{1458000}\)\(=\frac{1}{1000}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
b)4y+(1/3+1/9+1/27)=56/81
4y+40/81=56/81
4y=56/81-40/81
4y=16/81
y=16/81:4
y=4/81
b) Tìm y:
( y + \(\frac{1}{3}\)) + ( y + \(\frac{1}{9}\)) + ( y + \(\frac{1}{27}\)) + ( y + \(\frac{1}{81}\)) = \(\frac{56}{81}\)
y + ( \(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}\)) = \(\frac{56}{81}\)
y + \(\frac{27+9+3+1}{81}\) = \(\frac{56}{81}\)
y + \(\frac{40}{81}\) = \(\frac{56}{81}\)
y = \(\frac{56}{81}-\frac{40}{81}\)
y = \(\frac{16}{81}\)
Tl roy, ủng hộ nha! :)
![](https://rs.olm.vn/images/avt/0.png?1311)
(20,2 x 5,1-30,3x3,4+14,58) : (14,58x460+7,29x540x2)
= (103,02 – 103,02 + 14,58) : (14,58 x 460 + 14,58x540)
= 14,58 : [14,58 x (460 + 540)]
= 14,58 : (14,58 x 1000)
= 14,58 : 14580
= 0,001=\(\frac{1}{1000}\)
Biến đổi tử số và mẫu số , ta có :
Tử số =
20,2 x 51 - 30,3 x 3,4 + 14,58
= 103,02 - 103,02 + 14,58
= 0 + 14,58
= 14,58
Mẫu số =
14,58 x 460 + 7,29 x 540 x 2
= 14,58 x 460 + 14,58 x 540
= 14,58 x ( 460 + 540 )
= 14,58 x 1000
= 14580
Thay vào , ta có :
= 14,58 : 14580
= 0,001
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
\(\frac{20,2\times 5,1-30,3\times 3,4+14,58}{14,58\times 460+7,29\times 540\times 2}=\frac{10,1\times 2\times 5,1-10,1\times 3\times 3,4+14,58}{14,58\times 460+14,58\times 540}\\ =\frac{10,1\times 10,2-10,1\times 10,2+14,58}{14,58\times (460+540)}\\ =\frac{14,58}{14,58\times 1000}=\frac{1}{1000}\)