Làm ơn giúp mik vs
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\(\left|2y-5\right|=0\\ \Rightarrow2y-5=0\\ \Rightarrow2y=5\\ \Rightarrow y=\dfrac{5}{2}\)
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\(\dfrac{15^{21}.27^8.49^{29}}{21^{45}.25^{10}.7^{15}}\\ =\dfrac{\left(3.5\right)^{21}.\left(3^3\right)^8.\left(7^2\right)^{29}}{\left(3.7\right)^{45}.\left(5^2\right)^{10}.7^{15}}\\ =\dfrac{3^{21}.5^{21}.3^{24}.7^{58}}{3^{45}.7^{45}.5^{20}.7^{15}}\\ =\dfrac{3^{45}.5^{21}.7^{58}}{3^{45}.7^{60}.5^{20}}\\ =\dfrac{5}{7^2}\\ =\dfrac{5}{49}\)
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1/3x + (2/3 - 4/9) = -3/4
1/3x + (6/9 - 4/9) = -3/4
1/3x + 2/9 = -3/4
1/3x = -3/4 - 2/9
1/3x = -27/36 - 8/36
1/3x = -35/36
x = -35/36 : 1/3
x = -35/36 . 3
x = -35/12
(5/6 - 3/4) : -2x/3 = -12/19
(10/12 - 9/12) : -2x/3 = -12/19
1/12 : -2x/3 = -12/19
-2x/3 = 1/12 : -12/19
-2x/3 = 1/12 . -19/12
-2x/3 = -19/144
-2x = -19/144 . 3
-2x = -19/48
x = -19/48 : (-2)
x = -19/48 . -1/2
x = 19/96
1/3 . x + ( 2/3 - 4/9 ) = -3/4
1/3 . x + 30/27 = -3/4
x + 30/27 = -3/4 : 1/3
x + 30/27 = -9/4
x = -9/4 - 30/27
x = ?
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Trả lời:
Sau 3 lần giao dịch bà Lan còn lại số tiền là:
56 154 800 + 5 320 000 - 10 980 000 - 7 495 500 = 42 999 300 (đồng)