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.
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