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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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
=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
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