17/4×(25×68) 8/5÷1又3/2+5/3×8/3
15×(2/3+3/5)
= 15×2/3+15×3/5
=10+9
=19
〖5/6-(1/8+5/12)〗×3/7
=[5/6-13/24]×3/7
=7/24×3/7
=1/8
= 15×2/3+15×3/5
=10+9
=19
〖5/6-(1/8+5/12)〗×3/7
=[5/6-13/24]×3/7
=7/24×3/7
=1/8
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