The changing law of math diary's products. The changing law of writing products

1, two factors are multiplied, one factor is enlarged several times (except zero), and the other factor is reduced by the same multiple (except zero), and the product remains unchanged.

2. When two factors are multiplied, one factor is multiplied by several times (except zero), and the other factor is unchanged, and the product is also multiplied by the same multiple.

3. When two factors are multiplied, one factor is reduced by several times (except zero), while the other factor remains unchanged, and the product is also reduced by the same multiple.

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