Question

计算下列各题①（-3）×5+（-2）×（-3）；② 6×26×(- 1 3 )÷(- 13 6 ) ；③ (

计算下列各题①（-3）×5+（-2）×（-3）；② 6×26×(- 1 3 )÷(- 13 6 ) ；③ ( 11 12 - 7 6 + 3 4 - 13 24 )×(-48) ；④ - 5 2 -[ (-2) 3 +(1-0.8× 3 4 )÷(-2)] ．

Answer 1

①原式=-15+6=-9；     ②原式=6×26× 1 3 × 6 13 =24；    ③原式=-（ 11 12 ×48- 7 6 ×48+ 3 4 ×48- 13 24 ×48）=-（44-56+36-26）=2；     ④原式=-25-[-8-（1- 4 5 × 3 4 ）× 1 2 ]=-25-[-8- 2 5 × 1 2 ]=-25+8+ 1 5 = -16 4 5 ．