8/9减23/42用简便算法怎么做?

23.95\u51cf(10.8\u52a03.95)\u7b80\u4fbf\u8ba1\u7b97 \uff0824\u52a09.6\u96642.4\uff09\u4e580.5\u7b80\u4fbf\u7b97\u6cd5

23.95-(10.8+3.95)=23.95-3.95-11+0.2=9.2
(24+9.6/2.4)*0.5=(24+4)/2=14
3.67*2.8+3.67*7.2=3.67*(2.8+7.2)=3.67*10=36.7
125-100/(2.07-1.27)=125-100/0.8=125-125=0

\u5148\u6f84\u6e05\u4e00\u4e0b\uff0c17\u5206\u4e4b8\u5e94\u8be5\u6253\u62108/17\u800c\u4e0d\u662f17/8\uff0c\u4ee5\u4e0b\u6211\u89e3\u9898\u90fd\u75288/17\u4ee3\u886817\u5206\u4e4b\uff0c9\u53c817\u5206\u4e4b8\u6211\u8868\u793a\u62109&8/17
\u539f\u5f0f=9&8/17+2/23+2/17*9/23
=9+8/17+1/23\uff082+2/17*9)
=9+8/17+1/23(34/17+18/17)
=9+8/17+1/23*52/17
=9+1/17(8+52/23)
=9+1/17*236/23
=9+236/391
=9&236/391

8/9减23/42用简便算法怎么做?
【9,42】=126
所以
8/9-23/42
=112/126-69/126
=43/126

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