简便运算 23/22×21-23÷22/21 1/4÷7+1/7×3/4+6/7 11/13÷[(5/8+3/14)÷5/8]
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23/22×21-23÷22/21
=23/22×21-23×21/22
=23/22×21-23/22×21
=23/22×(21-21)
=0
1/4÷7+1/7×3/4+6/7
=1/4×1/7+1/7×3/4+1/7×6
=1/7×(1/4+3/4+6)
=1/7×7
=1
11/13÷[(5/8+3/14)÷5/8]
=11/13÷【(5/8+3/14)×8/5】
=11/13÷【5/8×8/5+3/14×8/5】
=11/13÷47/35
=11/13×35/47
=385/611
=23/22×21-23×21/22
=23/22×21-23/22×21
=23/22×(21-21)
=0
1/4÷7+1/7×3/4+6/7
=1/4×1/7+1/7×3/4+1/7×6
=1/7×(1/4+3/4+6)
=1/7×7
=1
11/13÷[(5/8+3/14)÷5/8]
=11/13÷【(5/8+3/14)×8/5】
=11/13÷【5/8×8/5+3/14×8/5】
=11/13÷47/35
=11/13×35/47
=385/611
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