【(-3)的三次方-(-5)的二次方】/(-20)=(-27-25)÷(-20)=-52÷(-20)=2.6
解:原式= [ -27 -25] /(-20) = -52 /(-20) = 2.6
(-3)的三次方是-27 .(-5)的二次方是25 原式 (-27-25)/(-20)=13/5
((-3)³-(-5)²)/(-20)=(-27-25)/(-20)=(-52)/(-20)=13/5