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简介:
90-9= 42+30= 46+5= 34+(25+5)=
65+20= 50-8= 20+67= 85-7=
65-47= 92-46= 35+40= 39+7-20=
37-7= 7+80= 48+6= 58-(58-8)=
54-8= 76-8= 90+4= 20+13-9=
98-70= 35+30= 86-5= 24-10-7=
8+45= 28+54= 36+57= 42+30=
28-8= 57+8= 9+70= 99-6=
26-3= 86-6= 72-50= 50-7=
8+57= 39+5= 25+7= 4+65=
73-40= 76-60= 68+29= 70-25=
50+21= 36-20= 80-60= 71+9=
75-5= 27+6= 24+3= 69+30=