Ask a primary school arithmetic problem to use the simplest method (1+0.23+0.34)X(0.23+0,34+0.65)－(1+0.23+0.34+0.65)X(0.23+0.34)=

(1 + 0.23 + 0.34) x (0.23 + 0,34 + 0.65) = 1x (0.23 + 0.34) + (0.23 + 0.34) x (0.23 + 0.34) + 1x0.65 + (0.23 + 0.34) x0.65 (extract common factor (0.23 + 0.34)) = (1 + 0.23 + 0.34 + 0.65) x (0.23 + 0.34) + 0.65, so we can know (1 + 0.23 + 0.34) x (0.23 + 0,34 + 0.65)

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