"632-385等于几"...632-385等于几

　"398+536等于几"...398+536等于几

　"674-398等于几"...674-398等于几

　"398+506等于几"...398+506等于几

　"632+478等于几"...632+478等于几

　"398-67等于几"...398-67等于几

　"638-374等于几"...638-374等于几

　"468-398等于几"...468-398等于几

　"398+426等于几"...398+426等于几

　"632-198等于几"...632-198等于几