答得好给高分:1/4*2/5+3÷4*2/5怎么样简算?(四分之一×五分之二加三除以四×五分之二)
人气:263 ℃ 时间:2019-08-18 14:49:49
解答
1/4*2/5+3÷4*2/5
=1/4×2/5+3×1/4×2/5
=1/4×2/5×(1+3)
=1/4×2/5×4
=2/5
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