Question

1)14·(1/7)^2-23·1/7=
2)15·(1/5)^2-8·1/5

Answer 1

1). 1/7*(14*1/7-23)=1/7*(2-23)=1/7*(-21)= -3;  2). 1/5*(15*1/5-8)=1/5*(3-8)=1/5*(-5)= -1.

Answer 2

$1 : : 14* frac{1}{49} - frac{23}{7} = 2* frac{1}{7} - frac{23}{7} = frac{2}{7} - frac{23}{7} = - 3 \ \ 2 : : 15* frac{1}{25} - frac{8}{5} = 3* frac{1}{5} - frac{8}{5} = frac{3}{5} - frac{8}{5} = - 1$