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
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
2