安居乐4
幼苗
共回答了21个问题采纳率:81% 举报
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2/3÷4/15-2.5
=2/3×15/4-2.5
=5/2-2.5
=0
3/11×2/7×7×1/2
=3/11×(2/7×7×1/2)
=3/11×1
=3/11
19/100×101
=19/100×(100+1)
=19+19/100
=19又19/100
3/8×1/15+5/8÷15
=3/8×1/15+5/8×1/15
=(3/8+5/8)×1/15
=1×1/15
=1/15
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1年前
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