5/8 * (-4/10) = 5/8 * (-2/5) = -1/4
3/5 : -21/20 =-( 3*20/5*21 )= -20/5*7 = -4/7
-1/4 - 4/7 = (-1*7 - 4*4) /28 = -23/28
1.)50,904÷(5,041-0,016*0,0625)1)0,016*0,0625=0,0012)5,041-0,001=5,043)50,904÷5,04=10,12)5/2от4,004=5/2*4,004=2,5*4,004=10,01