1 脱式计算,能简算的简算 (1)3-71 2 -51 2 (2)57 × 38 + 58 × 57 (3)81 5 × 51 6 + 52 7 ÷1 09 (4)18×(49 + 56 ) (5)23 ×7+ 23 ×5 (6)(16 -11 2 )×(24-45 ) (7)(57 × 47 + 47 )÷ 47 (8)15 ÷[(23 + 15 )× 11 3 ] (9)2 51 8 ×1 69 + 2 57 ×1 69 +1 69 (10))732 1495(6 3 (11)(32× 41 +17)÷1 25 (12)(25+43 )÷41 + 41 (13)(411 25 )65 (14)591 251 2795 (15)65524532 (16))732 1495(6 3 2 (17)2316]43)3121(85[ (18)(21× 73 + 74 ×21)× 41 (19)(99+109 )÷9 (20)54 × 65 ÷ 85 (21)1514 ÷[(54 +32 )×1110 ] (22)(65 + 54 )×30 (23) 31 +3÷ 21 (24) 65 × 56 -109 ÷ 59 (25)4-115 -117 (26)81 ×58+ 81 ×41+ 81 (27)54 × 74 × 45 - 21 (28) 54 × 65 + 52 ÷ 53 (29)54 ÷[(85 -21 )÷ 85 ] (30)235 - 135÷18 (31)35 ×153 – 0
6×53 (32)(45 +14 )÷73 + 710 3 (33)10 - 719 - 1219 + 119 (34)25×13 ÷52 × 310 (35)13
88 (36)12×103-4500÷75 (37)18 ×[12 ÷(