两道简便算法
1.199.199X198-198.198X199
2.18.9X178.178+0.49-17.8X189.189
（注：X=乘号）（注：X=乘号）
人气：448 ℃ 时间：2020-03-23 01:09:49
解答
1.=199X1.001X198-198X1.001X199=0-0=0 2.=18.9X178X1.001+0.49-17.8X189X1.001 =189X17.8X1.001+0.49-17.8X189X1.001 =189X17.8X1.001-17.8X189X1.001+0.49 =0+0.49=0.49
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