9.9×4.3
=(10-0.1)×4.3
=10×4.3-0.1×4.3
=43-0.43
=42.57
标签:九乘,三有,九点
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9.9×4.3
=(10-0.1)×4.3
=10×4.3-0.1×4.3
=43-0.43
=42.57
标签:九乘,三有,九点