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2.(29×10)×31=29×(10×31)
3.54×(12×5)=(54×12)×6
4.125×(9×16)=(125×9)×16
5.12×44=44×12
6.9×57=57×9
7.15×44=44×15
8.11×38=38×11
9.25×79=79×25
10.30×93=93×30