文档介绍：640^80=
15X5=
23x3=
12X2X5=
480+80=
16X5=
27X3=
90+15=
48+4=
640+16=
39+3=
24X20=
32X3=
48+16=
12X8=
27X32X50=
X2=
83
X360=
4X
530+280=
180
27X3=
—45=
96+
250=
310—
X500=
200X
104X5=
6=
7200+900=
240X30=
160=
300X
33=
3X
120乂2=
410-201=
125
।360X5=
1400=
60+
90+30=
X8=
750—
180X15=
12=
140X
270X30=
290=
45x7X2=
300=
55+5=
48X20=
390+140=
8X5X25=
5X400=
370
32X6=
11X80=
24
35x2X5=
X200=
65+
35X2=
x50=
530
4X9X50=
13=
15X
140X7=
-70=
420—
160+8+2=
10=
84+
13X6=
90=
7X
40+20=
21=
100—
280X3=
700=
80+40=
54=
370+580=
203+98=
60+30=
12X11=
350X2=
50
240X3=
+30=
220X40=
X11=
250X
24X30=
240+80=
90
15X 5=
23 x 3=
12X 2X 5=
480 + 80=
16X 5=
27 X 3=
90+ 15=
48 + 4=
640+ 16=
39-3=
24 X 20=
32 X 3=
480+80=400
+50=
320+40=
210-30=
60-20=
200-50=
360+40=
30X3=
80X9=
60X5=
90-30=
720+80=
12X 8=
27 x 3=
56- 14=
24-8=
14X 2=
83-45=
560 + 80=
96 + 24=
40 + 20=
40X30=
37+ 26=
76-39=
605+59=
30X23=
12X8=
27+32=
48+27=
4500X20=
73+15=
120X600=
200X360=
6800X400=
280+270=
4X2500=
6000+40=
5X1280=
310—70=
6X1300=
3X1400=
8600-4200=
400X14=
1300X50=
7000+14=
138—89=
5400
470+180=
200X48=
600+12=
+54=
200X34
1000+25=
930—660=
9600+80=
=
550—450=
160X600=
530+280=
140X300=
1800g600=
2700
20X420=
9200+400=
8800+40=
+30=
45X
290X300=
840+21=
9600+800=
14=
18万
8100+300=
180X500=
750—290=
+24万=
89
7600+200=
8000+500=
5X490=
+100=
7600+400=
1900+20=
760X20=
+=
680+270=
200X160=
7500+00=
73X1=
980+14=
8700+300=
370X200=
=
4200+30=
300X330=
650+13=
4+10=
17+1000=
150+70=
1-=
+=
356-98=
+10=
80X25=
125X8=
++=
1-=
612+6=
5X17X2=
=
12X80=
154-73-27=
+99=
=
1000K25=
100+25=
840+40=
24X0+12