题目
计算下列各题
(1)
10﹣(﹣19)+(﹣5)﹣167
(2)
(3)
(4)
(﹣36)×99
答案: 解:原式=10+19﹣5﹣167 =29﹣172 =﹣143
解:原式=﹣1×( 13 ﹣ 12 )×6÷2 =﹣6×( 13 ﹣ 12 )÷2 =(﹣6× 13 +6× 12 )÷2 =(﹣2+3)÷2 = 12
解:原式= 278 ×( 253 ﹣ 258 )÷ 2524 × 827 = 278 ×( 253 ﹣ 258 )× 2425 × 827 =( 253 ﹣ 258 )× 2425 = 253 × 2425 ﹣ 258 × 2425 =8﹣3=5
解:(﹣36)×99 7172 =﹣36×(100﹣ 172 ) =﹣3600+ 12 =﹣3599 12 .