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[1-(1/2+1/10)×5/9]÷4/9简便计算 5
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[1-(1/2+1/10)×5/9]÷4/9
=1÷4/9-(1/2+1/10)×5/9÷4/9
=9/4-6/10×5/9÷4/9
=9/4-6/10×5/4
=9/4-3/4
=6/4
=3/2
=1÷4/9-(1/2+1/10)×5/9÷4/9
=9/4-6/10×5/9÷4/9
=9/4-6/10×5/4
=9/4-3/4
=6/4
=3/2
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