文档介绍：45X5 =
248+89 =
155X5 =
25X2 =
45X7 =
85-18 =
9 + 18 =
25X4 =
45 X 9 =
11 + 22 =
115-24=
25X6 =
35X2 =
125-
5000-500=
2X9+3=
1804-3=
184-3=
3600-600=
3X4 + 5=
200X8=
3400-300=
30 X 2
2X7 + 8=
530-70=
120+400=
52 X 7
2X8 + 6=
850X2=
214-7=
100 X 4 400
2X9 + 5=
263-80=
700 + 800=
X 8
90X9=
8504-2=
9X4=
900X 5 =
8X ( ) <65
98 + 26X0=
484-6=
40 X 6 =
( )X9<38
6X3=
1200 + 800=
10 X 9 =
6X ( ) <49
494-7=
720 + 80=
3X8 =
( )X9<20
184-6=
8X7=
18 + 53 =
7X ( ) <50
45 + 32=
460+400=
3 X 7+4=
5X ( ) <32
244-8=
6X8=
4X6 + 2=
600X4=
48004-2=
84+7=
8X9+21-
50X9=
2004-2=
80-44=
4600+4700=
70X7=
304-3-
1800-900=
730-190=
8X800=
60004-2=
4900-1800=
3700-370=
5X500=
364-3=
420+80=
8500-5500=
19X4=
8004-4=
430+1000=
3200+5100=
()X3<25
3004-3-
500-60=
96-42-
2X ( ) <15
484-2=
89-8=
1200-400=
()X4<25
994~9=
64-8=
830-300=
4X7+9=
264-2=
34+9=
800+900=
3X6 + 7-
6004-3-
144-7=
58-36-
3X9 + 4=
384-1=
5+58=
7000+3000=
6X6 + 7=
934-3=
644-8=
5X7二
9X2 + 8=
774-7=
6X3-
724-9=
4X7+5=
4004-2=
9X9-
364-6-
404-2=
8004-4=
724-8=
814-9=
804-4=
50004-5=
78+15=
42+13=
484-2=
5004-5=
83-20=
244-3=
4004-2=
844-4-
43-30=
24+8=
8004-4=
9004-9=
94-1=
27-32=
4804-2=
4004-5=
280+450=
42+13=
40004-2=
274-9=
74-7=
42-6=
800094二
53+8=
3600+5800=
7+44二
424-7=
2X84-4=
9X3-8=
184-6-
64 — 8=
8X94-9=
304-6=
154-3=
214-3=
364-64-3=
364-4=
64-3-
4X8=
94-9X6=
4X5+44=
254-5=
544-9-
424-7X6=
484-8+7=
204-5-
49! 7=
96-80+7=
1800+200=
54-5=
424-7=
64-40-8-
93-80=
304-6
354-7=
40-4+20=
6X5+37=
94-3=
19+41=
7X5-8-
10-84-1=
4X3-
24 — 6X3=
144-7+25=
7X8=
164-4=
4X8-5-
154-5+8-
73-4=
124-4-
274-3+6=
8X9-8=
3X84-4=
84-2=
564-7-3-
1X2+20=
7X6+10=
244-4-
494-9+7-
164-8+30=
724-8=
4X4=
4X34-2-
7X7+8二
64-8=
204-4-
64-3X7=
544-6+33=
24X0=
244-6=
84-4X3=
510+200=
71-7+30=
2X5-
6X5+37=
15-454-9=
6 + 2X8-
1X1=