用简便方法计算 0.3÷[ 1 ÷(3.3-2.95) ]
问题描述：
用简便方法计算 0.3÷[ 1 ÷(3.3-2.95) ]
答
0.3÷[ 1 ÷(3.3-2.95) ]
=0.3÷{ 1 ÷[(3+0.3)-(3-0.05)]}
=0.3÷(1 ÷0.35)
=3/10÷(1÷35/100)
=3/10÷(1×20/7)
=3/10×7/20
=21/200
=20÷200+1÷200
=0.1+0.005
=0.105