解:4.9×5/7等于( 3.5 ) ∵已知需求出4.9×5/7等于多少 A × B = A * B = C ∴4.9 × 5/7 = (4×10+9)/10 × 5/7 = 49/10 × 5/7 = 7/2 = 3.5 答:4.9×5/7等于3.5
4.9×5/7=0.7×5=3.5
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4.9*5/7=0.7*5=3.5