原式=(100+46)x39+46x61 =100x39+46x39+46x61 =3900+46x(39+61) =3900+46x100 =3900+4600 =8500
如下计算:146×39+46×61=(100+46)×39+46×61=100×39+46×39+46×61=3900+46×(39+61)=3900+4600=8500