题目
计算下列各题
(1)
5﹣(﹣2)
(2)
(3)
11÷ ×(- )
(4)
( - + )÷(- )
(5)
(6)
答案: 解:5﹣(﹣2) =5+2 =7;
解: 614−3.3−(−6)−(−334)+4+3.3 = 614+(−3.3)+6+334+4+3.3 = [614+334]+[(−3.3)+3.3]+[6+4] =10+0+10 =20;
解:11÷ 17 ×(- 411 ) = 11×7×(- 411 ) =-28;
解:( 12 - 13 + 16 )÷(- 160 ) =( 12 - 13 + 16 )×(-60) = 12 ×(-60)- 13 ×(-60)+ 16 ×(-60) =-30+20-10 =-20;
解: (−3.59)×(−722)+2.41×722+6×(−722) = (−722)×[(−3.59)+(−2.41)+6] = (−722)×0 =0;
解: −23÷(−12)2+9×(−13)2−(−1)2020 = −8÷14+9×19−1 = −32+1−1 =-32.