时间停止的行星
幼苗
共回答了13个问题采纳率:92.3% 举报
(1)
12x(1/4 + 1/6 - 1/3) = 12/4 + 12/6 - 12/3
= 3 + 2 - 4 = 1
(2)
578 + 298 = 578 + 300 - 2 = 878 - 2 = 876
(3)
16/2.5 = 16*4/(2.5*4) = 64/10 = 6.4
(4)
69x5/23 = (69/23)x5 = 3x5 = 15
(5)
25 x 1/3 x 2/5 x 3/10 = (25 x 2/5)x(1/3 x 3/10)
= (5 x 2)x(1 / 10) = 1
1年前
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