题目

计算 (1) -22-|-18|+(-7)+(-15) (2) 0 (3) (4) [ ( ) ]÷5 答案: 解:原式=-22-18+(-7)+(-15) =-40-7-15 =-62 解:原式=0 −12+(+34)+(−56)−23 = −12+(+34)+(−56)−23 = 14−56−23 = 312−1012−812 = −1512 = −54 ; 解:原式= 25×(−512)−821×(−74)−12×12×72 = (−16)+23−78 = 12−78 = −38 ; 解:原式=[ 212− ( 79×36−1112×36+16×36 )]÷5 =[ 212− ( 28−33+6 )]÷5 =( 52 -1)÷5 = 32 ÷5 = 310 .
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