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6、3.125×(1.6+12/5)÷(5/2-0.625)7/5×1/7×6/13+5/7×1/5×3/13+1/13×3/7×2/536/35+64/63+100/99(5/4-0.8)÷0.63-(3/4÷0.45-7/5)(23/7+18/13×7)÷9/7-18/1367×1/4+5/2×3.75-9/2×25%789×788788-788×789789
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3.125×(1.6+12/5)÷(5/2-0.625)=0.666666667 7/5×1/7×6/13+5/7×1/5×3/13+1/13×3/7×2/5=9/6536/35+64/63+100/99=3/3/55 (5/4-0.8)÷0.63-(3/4÷0.45-7/5)=0.447619047(23/7+18/13×7)÷9/7-18/13=8/...
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