摘要:20+80= 34-20= 16+8= 38+5= 29-7= 32-8= 13+7= 54-30= 48+40= 7+17= 28-5= 64-4= 68-6= 33+8= 8+62= 54-6= 42+9= 27-9= 49+9= 60-40= 54-20-5= 54+20-8= 28―5―14= 13-7+45= 46+4+50= 86-8+11= 84+5-50= 90―60―24=
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