有理数加法计算题(1) (2) (3) )432(51. )4(1(4) ; (5) ; (6) (2.2)+3.8;)72(3312(7) +(5 ) ; (8)(+15)+(-20)+(+8)+(-6)+(+2) (9) (+2 )+( 2.2) ;316 51(10) ( )+(+0.8) ; (11) (6)+8+(4)+12; (12)152 3172741(13) (5 )+0; (14)0.36+(7.4)+0.3+(0.6)+0.64; (15)9+(7)+10+(3)+(69) ; 有理数加法计算题(1) (2) (3) )432(51. )4(1(4) ; (5) ; (6) (2.2)+3.8;)72(3312(7) +(5 ) ; (8)(+15)+(-20)+(+8)+(-6)+(+2) (9) (+2 )+( 2.2) ;316 51(10) ( )+(+0.8) ; (11) (6)+8+(4)+12; (12)152 3172741(13) (5 )+0; (14)0.36+(7.4)+0.3+(0.6)+0.64; (15)9+(7)+10+(3)+(69) ;