68.6+0.314*35+4分之3*31.4-100分之10*31.4

68.6+0.314*35+3/4*31.4-10/100*31.4
=68.6+3.14*3.5+7.5*3.14-3.14
=68.6+3.14(3.5+7.5-1)
=68.6+3.14*10
=68.6+31.4
=100

？？？？？？？？？？？？？？？？？？？？？？把小数化为分数就好了。，68.6+0.314*35+3/4*31.4-10/100*31.4
=68.6+3.14*3.5+7.5*3.14-3.14
=68.6+3.14(3.5+7.5-1)
=68.6+3.14*10
=68.6+31.4
=100

68.6+0.314x35+3/4x31.4-10/100x31.4
=68.6+3.14x3.5+7.5x3.14-3.14
=68.6+3.14(3.5+7.5-1)
=68.6+3.14x10
=68.6+31.4
=100

68.6+0.314*35+4分之3*31.4-100分之10*31.4
=68.6+31.4*0.35+4分之3*31.4-100分之10*31.4
=68.6+31.4*(0.35+0.75-0.1)
=68.6+31.4
=100