3.6×7.2+3.6×1.1-8.3×2.6
=3.6×(7.2+1.1)-8.3×2.6
=3.6×8.3-8.3×2.6
=8.3×(3.6-2.6)
=8.3×1
=8.3
3.6×7.2+3.6×1.1-8.3×2.6巧算
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