Question

Cho A = -12,7. 32,6 + 2,7.12,8 + 12,7.2,6+2,7.17,2. Giá trị của biểu thức A là:

Answer 1

\(A=12,7.\left(-32,6\right)+2,7.12,8+12,7.2,6+2,7.17,2\)

\(A=12,7\left(-32,6+2,6\right)+2,7\left(12,8+17,2\right)\)

\(A=12,7.\left(-30\right)+2,7.30\)

\(A=30\left(-12,7+2,7\right)=30.\left(-10\right)=-300\)

Answer 2

Answer 3

Ta có:

\(A=-12,7\cdot32,6+2,7\cdot12,8+12,7\cdot2,6+2,7\cdot17,2\)

\(A=12,7\cdot\left(-32,6\right)+2,7\cdot12,8+12,7\cdot2,6+2,7\cdot17,2\)

\(A=12,7\cdot\left(-32,6+2,6\right)+2,7\cdot\left(12,8+17,2\right)\)

\(A=12,7\cdot\left(-30\right)+2,7\cdot30\)

\(A=30\cdot\left(-12,7\right)+2,7\cdot30\)

\(A=30\cdot\left(-12,7+2,7\right)\)

\(A=30\cdot\left(-10\right)\)

\(A=-300\)

Vậy \(A=-300\)