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A simple calculation of 378 ／ 265 × 194 ／ 378 × 265 ／ 194
Using the law of commutation of multiplication
So the original formula is simplified
378÷378×（265÷265）×（194÷194）
=1x1x1
=1
Simple calculation of 12 * 21
zx
12×（20+1）
=12×20+12×1
=240+12
=252
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