"468-398等于几"...468-398等于几

　"398+67等于几"...398+67等于几

　"614-398等于几"...614-398等于几

　"398+497等于几"...398+497等于几

　"398+574等于几"...398+574等于几

　"632-398等于几"...632-398等于几

　"398+426等于几"...398+426等于几

　"486+398等于几"...486+398等于几

　"674+359等于几"...674+359等于几

　"426-398等于几"...426-398等于几