25÷100×42.5÷100
-5--5=
34 x 85
42.5÷100
20÷100×62.5÷100
20÷100÷62.5×100
15÷100×42.5÷100
16÷100×62.5×100
what is the expression equivalent to 4x^-2 + 3x^-5
