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关注公众号回复:奥数答案
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口算。
200-5 ×16 =
27 万+40 万=
(32+160 )×6 =
20 ×8 ÷4 =
23 ×8-50 =
56 亿-38 亿=
8000-3000 =
396-70+27 =
71+35 ×4 =
4000-3200 =
14 ×5 ×7 =
2 万+1000 =