0.31*68+0.68*68+0.68=(简便运算)

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0.31*68+0.68*68+0.68=(简便运算)0.31*68+0.68*68+0.68=(简便运算)0.31*68+0.68*68+0.68=(简便运算)=0.31*68+0.68*68+0.

0.31*68+0.68*68+0.68=(简便运算)
0.31*68+0.68*68+0.68=(简便运算)

0.31*68+0.68*68+0.68=(简便运算)
=0.31*68+0.68*68+0.01*68
=(0.31+0.68+0.01)*68
=1*68
=68