[2-(3/4+5/6)]÷6/7 1/8÷[(2/3-1/6)×7/10]
[2-(3/4+5/6)]÷6/71/8÷[(2/3-1/6)×7/10]8×(3/8+1/27)+19/27(1/15+3/49)×15-45/49...
[2-(3/4+5/6)]÷6/7 1/8÷[(2/3-1/6)×7/10]
8×(3/8+1/27)+19/27 (1/15+3/49)×15-45/49 展开
8×(3/8+1/27)+19/27 (1/15+3/49)×15-45/49 展开
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[2-(3/4+5/6)]÷6/7
=[2-(9/12+10/12)]÷6/7
=[2-19/12]÷6/7
=5/12×7/6
=35/72
1/8÷[(2/3-1/6)×7/10]
=1/8÷[(4/6-1/6)×7/10]
=1/8÷（1/2×7/10）
=1/8×20/7
=5/14
8×(3/8+1/27)+19/27
=3+8/27+19/27
=3+1=4
(1/15+3/49)×15-45/49
=1+45/49-45/9
=1
=[2-(9/12+10/12)]÷6/7
=[2-19/12]÷6/7
=5/12×7/6
=35/72
1/8÷[(2/3-1/6)×7/10]
=1/8÷[(4/6-1/6)×7/10]
=1/8÷（1/2×7/10）
=1/8×20/7
=5/14
8×(3/8+1/27)+19/27
=3+8/27+19/27
=3+1=4
(1/15+3/49)×15-45/49
=1+45/49-45/9
=1
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