Bài 1: Tính nhanh
\(\frac{20,2x5,1-30,3x3,4+14,58}{14,58x460+7,29x540x2}\)
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Tính nhanh 20,2x5,1-30,3x3,4+14,58 / 14,58x460+7,29x540x2
\(\frac{20,2\times5,1-30,3\times3,4+14,58}{14,58\times460+7,29\times540\times2}\)
\(=\frac{10,1\times2\times5,1-10,1\times3\times3,4+14,58}{14,58\times460+14,58\times540}\)
\(=\frac{10,1\times\left(2\times5,1-3\times3,4\right)+14,58}{14,58\times\left(460+540\right)}\)
\(=\frac{10,1\times0+14,58}{14,58\times1000}\)
\(=\frac{14,58}{14580}\)\(=\frac{1458}{1458000}\)\(=\frac{1}{1000}\)
Bạn giỏi ghê bài này đúng hoàn toàn > .^
20,2x5,1-30,3x3,4+14,58/14,58x460+7,29x540x2
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
20,2x5,1-30,3x3,4+14,58
------------------------------------
14,58x460+7,29x540x2
\(\frac{20,2x5,1-30,3x3+14,58}{14,58x460+7,29x2x540}\)
a)Tính nhanh:
\(\frac{20,2x5,1-30,3+3,4+14,58}{14,58x460+7,29x540x2}\)
b)Tìm y biết
(y + \(\frac{1}{3}\)) + (y+\(\frac{1}{9}\)) + (y+\(\frac{1}{27}\)) + (y+\(\frac{1}{81}\)) = \(\frac{56}{81}\)
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! :)
Nhầm sorry
( y + 1/3 ) + ( y + 1/9 ) + ( y + 1/27 ) + ( y+ 1/81) = 56/81
4y + ( 1/3 + 1/9 + 1/27 + 1/81) = 56/81
4y + 40/81 = 56/81
4y = 56/81 - 40/81
4y = 16/81
y = 16/81 : 4
y = 4/81
Sorry nhìu
\(\frac{20,2\times5,1-30,3\times3,4+14,58}{14,58\times460+7,29\times540\times2}\)
Tính nhanh nha giúp mình với.
Bài 10: Tính nhanh:
20,2 x 5,1 -30,3 x3,4 + 14,58
14,58 x 460 + 7,29 x 540 x 2
a, 20,2 x 5,1 - 30,3 x 3,4 + 14,58
= 10,1 x 2 x 5,1 - 10,1 x 3 x 3,4 + 14,58
= 10,1 x 10,2 - 10,1 x 10,2 + 14,58
= 0 + 14,58
= 14,58
b, 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
= 14 580
Hok tốt !
Đáp án là: \(\frac{1}{1000}\)
tính nhanh
20,2 x 5,1 - 30,3 x 3,4 + 14,58/ 14,58 x 460 + 7,29 x 540 x 2
Lời giải:
\(\frac{20,2\times 5,1-30,3\times 3,4+14,58}{14,58\times 460+7,29\times 540\times 2}=\frac{10,1\times 2\times 5,1-10,1\times 3\times 3,4+14,58}{14,58\times 460+14,58\times 540}\\ =\frac{10,1\times 10,2-10,1\times 10,2+14,58}{14,58\times (460+540)}\\ =\frac{14,58}{14,58\times 1000}=\frac{1}{1000}\)
tính nhanh :(24,2 x 5,1-34,3 x 3,4 14,58)/(14,58 x 460 7,29 x 540-2)'