A-A+
520+480=670-500=65万+47万=500-240=437+163=820-56
问题详情
参考答案
520+480=1000,670-500=170,65万+47万=112万,500-240=260,437+163=600,820-560=260,34×200=6800,25×300=7500,3600÷300=12,8400÷600=14,1900+5400=7300,2300-800=1500,27×4×5=540,35×5×2=350,25×24=600,360÷8÷5=9.
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