简便运算:1/17x4/9+5/17x1/9=1/7
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简便运算:1/17x4/9+5/17x1/9=1/7简便运算:1/17x4/9+5/17x1/9=1/7简便运算:1/17x4/9+5/17x1/9=1/71/17x4/9+5/17x1/9=1/17
简便运算:1/17x4/9+5/17x1/9=1/7
简便运算:1/17x4/9+5/17x1/9=1/7
简便运算:1/17x4/9+5/17x1/9=1/7
1/17x4/9+5/17x1/9
=1/17x4/9+1/17x5/9
=1/17x(4/9+5/9)
=1/17x1
=1/17
1/17(4/9+5/9)=1/17
1/17x4/9+5/17x1/9 =1/17x1/9(4+5) =1/17
1/17x4/9+5/17x1/9
=1/17x1/9(4+5)
=1/17
1/17×4/9+5/17×1/9 =1/17×4/9+1/17×5/9 =1/17×(4/9+5/9) =1/17×1 =1/17
简便运算:1/17x4/9+5/17x1/9=1/7
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