199.4乘19.93-199.3乘19.92 递等式199.4乘19.93-199.3乘19.92递等式

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199.4乘19.93-199.3乘19.92递等式199.4乘19.93-199.3乘19.92递等式199.4乘19.93-199.3乘19.92递等式199.4乘19.93-199.3乘19.9

199.4乘19.93-199.3乘19.92 递等式199.4乘19.93-199.3乘19.92递等式
199.4乘19.93-199.3乘19.92 递等式
199.4乘19.93-199.3乘19.92
递等式

199.4乘19.93-199.3乘19.92 递等式199.4乘19.93-199.3乘19.92递等式
=19.93×199.4-19.93×199.2
=19.93×(199.4-199.2)
=19.93×0.2
=3.986