3×(15/17-3/4)÷(3/4)怎样简便怎样算?
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3×(15/17-3/4)÷(3/4)
=3×(15/17-3/4)×4/3
=3×15/17×4/3-3×3/4×4/3
=60/17-3
=51/17+9/17-3
=3+9/17-3
=9/17
=17分之9
=3×(15/17-3/4)×4/3
=3×15/17×4/3-3×3/4×4/3
=60/17-3
=51/17+9/17-3
=3+9/17-3
=9/17
=17分之9
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