Question

tính nhanh \(\frac{327.412+400}{328.412-12}\)

Answer 1

\(\frac{327\cdot412+400}{328\cdot412-12}\)

\(=\frac{327\cdot412+400}{\left(327+1\right)\cdot412-12}\)

\(=\frac{327\cdot412+400}{327\cdot412+\left(412-12\right)}\)

\(=\frac{327\cdot412+400}{327\cdot412+400}\)

\(=1\)

Answer 2

  327.412+400 / 328.412-12

= 327.412+400 / (327+1).412-12

= 327.412+400 / 327.412+1.412-12

= 327.412+400 / 327.412+412-12

= 400/412-12

= 400/400

= 1