Question

Tính nhanh Abằng 111nhân 112 cộng 111nhân 112 trên 222nhân 224 cộng 222 nhân 224 cộng 222 nhân 224

Answer 1

\(A=\frac{111.112+111.112}{222.224+222.224+222.224}\)

\(A=\frac{111.112+111.112}{111.112.4+111.112.4+111.112.4}\)

\(A=\frac{111.112.\left(1+1\right)}{111.112.\left(4+4+4\right)}\)

\(A=\frac{111.112.2}{111.112.12}\)

\(A=\frac{2}{12}\)

\(A=\frac{1}{6}\)

_Chúc bạn học tốt_

Answer 2

\(A=\frac{111\times112+111\times112}{222\times224+222\times224+222\times224}\)

\(A=\frac{111\times112\times2}{111\times112\times4+111\times112\times4+111\times112\times4}\)

\(A=\frac{111\times112\times2}{111\times112\times4\times3}\)

\(A=\frac{1}{6}\)

Answer 3

a = 1/6

Answer 4

A=\(\text{ }\frac{111x112+111x112}{\text{222 x 224 + 222 x 224}}\)

A=\(\frac{111x112+111x112}{111x2x112x2+111x2x112x2}\)

A = \(\frac{1x1+1x1}{1x2x1x2+1x2x1x2}\)

A=\(\frac{1+1}{2x2+2x2}\)

A=\(\frac{2}{4+4}\)

A=\(\frac{2}{8}\)

A=\(\frac{1}{4}\)

Answer 5

A=\(\frac{111\cdot112+111\cdot112}{222\cdot224+222\cdot224+222\cdot224}\) = \(\frac{\left(111\cdot112\right)\cdot2}{\left(111\cdot2\cdot112\cdot2\right)\cdot3}\).

Lần lượt bỏ 111,112 ta còn:

\(\frac{2}{2\cdot2\cdot3}\) = \(\frac{2}{12}\) = \(\frac{1}{6}\)