1又1/2*5/7-(-5/7)*2又1/2+(-1/2)如团*5/7
=1又1/2*5/7+5/渣缓橘7*2又1/2-1/2*5/7
=(1又1/2+2又1/哪渣2-1/2)*5/7
=(1+1/2+2+1/2-1/2)*5/7
=(3+1/2)*5/7
=7/2*5/7
=5/2
=2+1/2
=2又1/2
-3.14*65.2+6.28*(-23.3)-1.57*36.4
=-3.14*65.2-2*3.14*23.3-0.5*3.14*36.4
=-3.14*65.2-46.6*3.14-18.2*3.14
=-3.14*(65.2+46.6+18.2)
=-3.14*130
=408.2
sha
(1)5/2
5/2
-2041/5