Ten and two are twelve还是is

英语中，这种表示加减乘除算式的句子中，运算结果是单数意义，所以be动词都只能用is，不能用are，如one and two is three(1加2等于3)，four minus three is one.(4减3等于1)，two times four is eight.(2乘以4等于8)，six devided by two is three.(6除以2等于3)。