31*19.97+199.7*6.8+199.7*0.1= 简算
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31*19.97+199.7*6.8+199.7*0.1=简算31*19.97+199.7*6.8+199.7*0.1=简算31*19.97+199.7*6.8+199.7*0.1=简算=（31/10
31*19.97+199.7*6.8+199.7*0.1= 简算
31*19.97+199.7*6.8+199.7*0.1= 简算
31*19.97+199.7*6.8+199.7*0.1= 简算
=（31/10）*（19.97*10）+199.7*6.8+199.7*0.1
=3.1*199.7+199.7*6.8+199.7*0.1
=199.7*(3.1+6.8+0.1)
=199.7*10
=1997
原式=31*19.97+19.97*10*6.8+19.97*10*0.1
=31*19.97+68*19.97+19.97
=19.97*（31+68+1）
=1997
=31*19.97+19.97*68+19.97*1=19.97*(31+68+1)=1997
=199.7*（3.1+6.8+0.1）=199.7*10=1997