1、(1)328-476+1-; (2)275-2-3+1;(3)42(-1)-1(-0.125); (4)(-48) 82-(-25) (-6)2;(5)-+()(-2.4). (6)-231(-1)2(1)2;(7)-14-(2-0.5)()2-()3; (8)-11-3(-)2-( )2(-2)3(-)3(9)(0.12+0.32) -22+(-3)2-3; (10)-6.2432+31.2(-2)3+(-0.51) 624.(11)-32- (12)1+(-2)4(-);(13)5-3-2+4-3(-2)2-(-4) (-1)3-7. (14) (-4)x4+(-9)x2 (15) (-1
2、)x(-6x)(16)9x(-7) (17)2x(-7)x(-3) (18)-7-(-6)x(-1)(19) 39+-23+0+-16 (20)-18+29+-52+60(21)-3+-2+-1+0+1+2 (22)-301+125+301+-75 (23)-1+-1/2+3/4+-1/4 (24)-7/2+5/6+-0.5+4/5+19/6(25)-26.54+-6.14+18.54+6.14 (26)1.125+-17/5+-1/8+-0.6(27) -7.2-2.6+15.6-10.2-6+4.3 (28)(-1 )-1 +(-2 )-(-3 )-(-1 )+4(29) |-2 |+(-3.7)+|-(+2.7)|-|-(7 )|参考答案1(1)-0.73 (2)-1; (3)-14; (4)-; (5)-2.9 (6)-3 (7)-1; (8)- ; (9)1; (10)-624.(11)-31; (12)-8 (13)224(14)-34 (15)3 (16)68 (17)252 (18)-13 (19) 0(20)19(21)-3(22)50(23)-1(24)1.25(25)-8(26)-3 (27)-6.1 (28)3 (29)-6