题目内容
120÷[4×3.9+(7.45-3.05)]×3.
120÷[4×3.9+(7.45-3.05)]×3,
=120÷[4×3.9+4.4]×3,
=120÷[4×3.9+4×1.1]×3,
=120÷[4×(3.9+1.1)]×3,
=120÷[4×5]×3,
=120÷20×3,
=6×3,
=18.
=120÷[4×3.9+4.4]×3,
=120÷[4×3.9+4×1.1]×3,
=120÷[4×(3.9+1.1)]×3,
=120÷[4×5]×3,
=120÷20×3,
=6×3,
=18.
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