8.6x5.7+4.3x4.3x2
=8.6x5.7+4.3x2x4.3
=8.6x5.7+8.6x4.3
=8.6x（5.7+4.3）
=8.6x10
=86
8.6x5.7+4.3x4.3x2（巧算）
2个回答
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