"398+67等于几"...398+67等于几

　"398-379等于几"...398-379等于几

　"398+497等于几"...398+497等于几

　"398+196等于几"...398+196等于几

　"398+426等于几"...398+426等于几

　"398+574等于几"...398+574等于几

　"674-398等于几"...674-398等于几

　"398+597等于几"...398+597等于几

　"398+398等于几"...398+398等于几

　"398+506等于几"...398+506等于几