Question

[quyen my]

A=12:{390:[500-(125+35.7)]}

B=12000-(1500.2+1800.3+1800.2:3)

C=(11.3²².3⁷-9¹⁵):(2.3¹⁴)²

GIÚP MIK VỚI NHA CẢM ƠN MỌI NGƯỜI.

Answer 1

[Huỳnh Quang Sang]

A = 12 : {390 : [500 - (125 + 35.7)]}

A = 12 : {390 : [500 - (125 + 245)]}

A = 12 : {390 : [500 - 370]}

A = 12 : {390 : 130}

A = 12 : 3 = 4

B = 12000 - (1500 . 2 + 1800.3 + 1800.2 : 3)

B = 12000 - (3000 + 5400 + 1200)

B = 12000 - 9600 = 2400

C = \(\frac{11\cdot3^{22}\cdot3^7-9^{15}}{\left(2\cdot3^{14}\right)^2}=\frac{11\cdot3^{22}\cdot3^7-\left(3^2\right)^{15}}{2^2\cdot3^{28}}=\frac{11\cdot3^{29}-3^{30}}{2^2\cdot3^{28}}=\frac{11\cdot3\cdot3^{28}-3^2\cdot3^{28}}{2^2\cdot3^{28}}\)

\(=\frac{33\cdot3^{28}-9\cdot3^{28}}{4\cdot3^{28}}=\frac{\left(33-9\right)\cdot3^{28}}{4\cdot3^{28}}=\frac{24}{4}=6\)