(1)2³-3²-(﹣2)×(﹣7) (2)-1⁴-6分之1[2-(﹣3)³]
问题描述:
(1)2³-3²-(﹣2)×(﹣7) (2)-1⁴-6分之1[2-(﹣3)³]
(3)-4分之1×(﹣2)³-[1﹣1÷(2又2分之1)]÷5分之4
答
(1)2³-3²-(﹣2)×(﹣7)
=8-9-14
=-1-14
=-15
(2)-1⁴-6分之1[2-(﹣3)³]
=-1-1/6×(2+27)
=-1-29/6
=-35/6 (-6分之35)
(3)-4分之1×(﹣2)³-[1﹣1÷(2又2分之1)]÷5分之4
=1/4x8-[1-2/5]x5/4
=2-3/5x5/4
=2-3/4
=5/4 (4分之5)