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6/5×5/9+4/5×5/9+5/9=? 7/8-7/8×1/9+7/8×8/9=? 1又1/2×3/4+1/2×3/4+3/4=?要简便运算
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第1个回答 2012-09-04
6/5×5/9+4/5×5/9+5/9
=5/9×(6/5+4/5+1)
=5/9×3
=5/3
7/8-7/8×1/9+7/8×8/9
=7/8×(1-1/9+8/9)
=7/8×(8/9+8/9)
=7/8×16/9
=14/9
1又1/2×3/4+1/2×3/4+3/4
=3/4×(3/2+1/2+1)
=3/4×3
=9/4
第2个回答 2012-09-04
6/5×5/9+4/5×5/9+5/9
=6/9+4/9+5/9
=6/9+(4/9+5/9)
=2/3+1
=5/3
7/8-7/8×1/9+7/8×8/9
=7/8x(1-1/9+8/9)
=7/8x16/9
=14/9
1又1/2×3/4+1/2×3/4+3/4
=3/4x(3/2+1/2+1)
=3/4x3
=9/4本回答被提问者采纳
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