9/10÷{1/2×(6/5-3/10)}
=9/10÷{1/2×(12/10-3/10)}
=9/10÷(1/2×9/10)
=9/10×20/9
=2
9/10÷{1/2×(6/5-3/10)}
=9/10÷{1/2×(12/10-3/10)}
=9/10÷(1/2×9/10)
=9/10÷9/20
=9/10×20/9
=2
最后结果是2
9/10÷{1/2×(6/5-3/10)}
=9/10÷(1/2×9/10)
=9/10÷1/2÷9/10
=9/10÷9/10÷1/2
=1÷1/2
=2