Question

a ) 27 . 75 + 25 . 27 - 150

b ) 12 : { 390 : [ 500 - ( 125 + 75 . 7 ) ] }

Answer 1

a) 27.75+25.27-150

= 27.(75+25)-150

= 27.100-150

= 2550

b) 12:{390:[500-(125+75.7)]}

= 12:{390:(500-25.26)}

= 12:{390:[25.(20-26)]}

= 12:(390:(-150)]}

= 12 : \(\dfrac{-13}{5}\)

= \(\dfrac{-60}{13}\)

Answer 2

a)27.75+25.27-150=27.(75+25)-150=27.100-150=2700-150=26850

b)\(12:\left\{390:\left[500-\left(25.5+25.3.7\right)\right]\right\}\)

\(=12:\left\{390:\left[25.20-25.26\right]\right\}\)

\(=12:\left\{3.10.13:\left[-25.6\right]\right\}\)

\(=12:\left(\dfrac{-13}{5}\right)=-12.\dfrac{5}{13}=\dfrac{-60}{13}\)

Answer 3

a,27.75+25.27-150
=27(75+25)-150
=27.100-150
=2700-150
=2550
b)12:{390:[500-(125+75.7)]}
=12:{390:[500-650]}
=12:{390:(-150)}
=12:(-2.6)
=-\(-4\dfrac{8}{13}\)