题目
计算
(1)
23-17-(-7)+(-16);
(2)
2×(﹣1)﹣3÷(﹣5)× ;
(3)
0﹣(+5)﹣(﹣3)+(﹣4);
(4)
(﹣3)×(﹣9)+8×(﹣5);
(5)
( ﹣ ﹣ )×(﹣30);
(6)
-(-0.2)+1.
答案: 解:23-17-(-7)+(-16) =23-17+7-16 =30-33 =-3;
解:2×(-1)-3÷(-5)× 13 =-2+3× 15 × 13 =-2+ 15 = −145 ;
解:0-(+5)-(-3)+(-4) =0-5+3-4 =-6;
解:(-3)×(-9)+8×(-5) =27-40 =-13;
解:( 35 - 16 - 32 )×(-30) =- 35 ×30+ 16 ×30+ 32 ×30 =-18+5+45 =32;
解: (−65) -(-0.2)+1 = (−65) + 15 +1 =0.