Question

Answer 1

\(a,=145\left(99+1\right)-143\left(101-1\right)\\ =145.100-143.100\\ =14500-14300\\ =200\\ b,=\dfrac{68\left(85-74\right)}{17.4}\\ =\dfrac{68.11}{68}\\ =11\)

Answer 2

`a) =145xx100-143xx100=100xx(145-143)=100xx2=200`

`b) =(68xx11)/(17xx4)=11`

Answer 3

d)67x48-48x66-38-10
=48x(67-66)-(38+10)
=48x1-48=0
a)(145x99+145)-(143x101-143)
=145x(99+1)-143x(101-1)
=(145-143)x100=2x100=200
b)\(\dfrac{68\times85-74\times68}{170:10\times4}=\dfrac{68\times\left(85-74\right)}{17\times4}\)\(=\dfrac{68\times11}{68}=11\)