Question

a)TÍNH BẰNG CÁCH THUẬN TIỆN

123 x 54 + 27 x 123 - 12 x 123 + 123 x 31

b)TÌM n

121/27 x 54/11 < n < 100/21 : 25/126

Answer 1

\(a,123\times54+27\times123-12\times123+123\times31\)

\(=123\times\left(54+27-12+31\right)\)

\(=123\times100\)

\(=12300\)

\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)

\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)

\(22< n< 24\)

Vì \(23>22\) và \(23< 24\) nên \(n=23\)

 

Answer 2

a, 123x(54+27-12+31)

=123x100

=12300