2-【1-(2分之1)*3分之1】*(-0.75)的二次方+(-0.5)的立方*5的平方
=2-(1-1/6)x(3/4)²+（-1/2）³x25
=2-5/6x9/16-1/8x25
=2-15/32-25/8
=2-15/32-100/32
=-51/32
如追加其它问题,采纳本题后点击想我求助,