【答案】口算练习题
(1) 9-5-1= (11) 4-0+1= (21) 3+0-3= (31) 7-0-3= (41) 2+4-1=
(2) 4+0+4= (12) 4-2-1= (22) 5+2-3= (32) 2+3+2= (42) 4-3+4=
(3) 3+2-5= (13) 2+8-8= (23) 5+1-0= (33) 5+2-7= (43) 3-1+5=
(4) 5-2+7= (14) 3+7-0= (24) 9-5-2= (34) 7-4+1= (44) 8-6-2=
(5) 8-4+5= (15) 6-0-2= (25) 6-4+2= (35) 6-4+8= (45) 9-7+6=
(6) 7+3-8= (16) 6+3-4= (26) 5-4+1= (36) 9-8+5= (46) 3+6+0=
(7) 1+0+7= (17) 2-2+7= (27) 1+6-3= (37) 3+1-3= (47) 2+3-4=
(8) 3+6-8= (18) 6-2+5= (28) 9-7+8= (38) 3+4+3= (48) 2+1-3=
(9) 7-3+2= (19) 5+4-1= (29) 4-0+3= (39) 5-2-3= (49) 5+1+3=
(10) 9+1-9= (20) 2+3-2= (30) 2+0+7= (40) 3-0-1= (50) 6+4-6=
标准答案:
(1)3 (2)8 (3)0 (4)10 (5)9 (6)2 (7)8 (8)1 (9)6 (10)1 (11)5 (12)1 (13)2 (14)10 (15)4 (16)5 (17)7 (18)9 (19)8 (20)3 (21)0 (22)4 (23)6 (24)2 (25)4 (26)2 (27)4 (28)10 (29)7 (30)9 (31)4 (32)7 (33)0 (34)4 (35)10 (36)6 (37)1 (38)10 (39)0 (40)2 (41)5 (42)5 (43)7 (44)0 (45)8 (46)9 (47)1 (48)0 (49)9 (50)4
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