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How many multiplication formulas can you write for the whole ten times one digit, Lu 240?
30×8＝240；80×3＝240；40×6＝240；60×4＝240.
There are several kinds of multiplication formulas. What are they?
Now there are only two kinds of multiplication formulas in grade two
Square difference formula: (a + b) (a-b) = a ^ 2-B ^ 2
Complete square formula: ① (a + b) ^ 2 = a ^ 2 + 2Ab + B ^ 2
②（a-b)^2=a^2－2ab+b^2
also
Cubic sum formula: (a + b) (a ^ 2-AB + B ^ 2) = a ^ 3 + B ^ 3
Cubic difference formula: (a-b) (a ^ 2 + AB + B ^ 2) = a ^ 3-B ^ 3
What are the multiplication formulas of 2400?
More
2*1200 4*600 8* 300
12*200 24*100 48*50
96*25 .
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