0.86+8.6x9.9 =0.1*8.6+8.6*9.9=(0.1+9.9)*8.6=86
3。35.2×45.6＋45.6×63.8＋45.6=（35.2+63.8+1）*45.6=45605、（0.83+11.7）*0.068=0.85204
86，对不对啊，亲
