文档介绍：45X7=45X9=35X2=35X4=35X6=35X8=35X3=35X5=35X7=35X9=125X2=125X4=125X6=125X8=125X3=125X5=125X7=125X9=123+25=80-17=10+20=120=
50-23=
6X6+6=
46X20=
3000-400=
35X0=
43-24=
85-42=
420+7=
40X6=
11X9=
90-31=
6X80+20=
300X6=
120X3=
60X9=
420-330=
7+3X4=
360+80=
55+41=
5X28=
90-26=
300X7=
30X4=
60X5=
8X6+7=
85+47=
81+12=
17X3=
52+23=
310X3=
200X5=
45+32=
460+400=
3X8=
320X2=
24+8=
6X8=
18+53=
660+6=
40+5=
6X7=
3X7+4=
700X2=
500+300=
45+5=
4X6+2=
80X3=
450+500=
200+800=
5X9+6=
70+550=
360-80=
24-6=
3X8+9=
800X6=
50+800=
8X3=
9X2+4=
500X4=
9X6=
3000-1500=
5X200=
540+9=
72+8=
760+60=
〔〕X5<37
14X5=
28+7=
35+7=
7X〔〕<43
350-80=
5X9=
27+53=
〔〕X9<64
570+50=
360-30=
240-120=
4X400=
23X3=
730-700=
5000-500=
900X3=
180+3=
18+3=
3600-600=
800X4=
200X8=
3400-300=
30X
2X9+3=
530-70=
120+400=
2
3X4+5=
850X2=
21+7=
52X
2X7+8=
263-80=
700+800=
7
2X8+6=
850+2=
9X4=
100X4
2X9+5=
98+26X0=
48+6=
400X8
90X9=
6X3=
1200+800=
900X5=
8X〔〕<65
49+7=
720+80=
40X6=
〔〕X9<38
18+6=
8X7=
10X9=
6X〔〕<49
〔〕
X9<20
|480+2=
400+5=
7X〔
〕<50
'4000+2=
27+9=
5X〔
〕<32
8000+4=
53+8=
600X4=
4800+2=
84+7=
50X9=
200+2=
80-44=
70X7=
30+3=
1800-900=
8X800=
6000+2=
4900-1800=
5X500=
36+3=
420+80=
19X4=
800+4=
430+1000=
〔〕
X3<25
300+3=
500-60=
2X〔
〕<15
48+2=
89-8=
〔〕X4<25