问题描述:
(-15 2/3)-[(-13 2/3)+(-31 2/5)+(+14)]
1.-3/4+7/6+1/3-1/2
2.(+3 3/5)-(-4 3/4)-(+1 3/5)+(-3 3/4)
3.4.7-(-8.9)-7.5+(-6)
1.-3/4+7/6+1/3-1/2
2.(+3 3/5)-(-4 3/4)-(+1 3/5)+(-3 3/4)
3.4.7-(-8.9)-7.5+(-6)
问题解答:
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