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巧算18x222.2-666.6

题目详情
巧算18x222.2-666.6
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答案和解析
18x222.2-666.6
=18×222.2 - 222.2×3
=222.2×(18-3)
=222.2×15
=222.2×10+222.2×5
=2222+1111
=3333