5121.3× 641.8÷ 80.5= 8?
5121.3× 641.8÷ 80.5= 8? (8)3 x 1.3x (8)2 x 1.8÷ 80.5= 8? 83.9 + 3.6 - 0.5= 8? 87.5 - 0.5= 8? ? = 7
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