(4+2/3)÷7 - 1/9 + [4÷(1+1/3) -(2+1/6)] + (5+1/2) - (3+1/8)
= 14/3÷7 - 1/9 + [4÷4/3 -(2+1/6)] + (5+1/2) - (3+1/8)
= 2/3- 1/9 + [3 -(2+1/6)] + (5+1/2) - (3+1/8)
= 2/3- 1/9 + 3 -(2+1/6) + (5+1/2) - (3+1/8)
= (3-2+5-3) +( 2/3- 1/9 -1/6 +1/2-1/8)
= 3 + ( 2/3- 1/9 -1/6) +(1/2-1/8)
= 3 + 7/18 + 3/8
= 3 + (28+27)/72
= 3又55/72
3又72分之64 好多年不算分数了 看到这个题目 提起了我的兴趣
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