文档介绍：-
. z.
20+5= 64-32= 87-72=
88-8=
50-19= 74-68= 58+16=
18+56= 27+70= 53-4=
79-32= 24+49= 23-10=
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. z.
20+26= 45-43= 21+35=
34-13= 65-23= 48+7=
27+34= 100-28= 2+55=
89-67= 37+47= 44-31=
5+48= 42+2= 59+3=
96-43= 48-7= 16-14=
92-63= 17+1= 30+41=
48-47= 50+18= 67+12=
53+22= 63+10= 65-21=
16+70= 59-38= 23+24=
46-29= 23-6= 8+72=
12+58= 80-6= 9+54=
99-45= 68-6= 51-49=
7+5= 59-5= 32-1=
2+75= 81+18= 92-83=
95-75= 24-3= 39-13=
17+3= 78+4= 81-2=
72+10= 55-16= 74-49=
70+26= 26+50= 69-29=
39+45= 80-61= 83+7=
45-35= 29+24= 72+7=
48+27= 60-29= 21+55=