6/7×1/8+1/7×1/8+1/7=? 1/2×2/3×1/3+1/2=? 4/5×5/9+4/9×4/5=? 要简便运算
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6/7×1/8+1/7×1/8+1/7
=(6/7+1/7)×1/8+1/7
=1/8+1/7
=15/56
1/2×2/3×1/3+1/2
=1/2×2/9+1/2
=1/2×(2/9+1)
=1/2×11/9
=11/18
4/5×5/9+4/9×4/5
=4/5×(5/9+4/9)
=4/5×1
=4/5
=(6/7+1/7)×1/8+1/7
=1/8+1/7
=15/56
1/2×2/3×1/3+1/2
=1/2×2/9+1/2
=1/2×(2/9+1)
=1/2×11/9
=11/18
4/5×5/9+4/9×4/5
=4/5×(5/9+4/9)
=4/5×1
=4/5
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