2024-12-14 23:10| 查看: 1
解:原式=-16+(-4)² -2
=-16+16-2
=-2
(3)
解:原式=-10+8÷4-12
=-10+2-12
=-20
(4)
解:原式=25-3×(-9+6)+25
=25+9+25
=59
7.