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We love math. Multiplying by four equals learning numbers and loving us. So, what do we love mathematics for?
We love math.

× 4

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Learn to count. Love me. I love me.

You can know that I am 1 or 2 by not carrying after I× 4, but the result is me, so it can only be 2.

From this, it is known that =8, and there is no carry after ×4, so = 1, number =7, love =9,

2 1978×4=879 12