"621-348等于几"...621-348等于几

　"621-367等于几"...621-367等于几

　"621+848等于几"...621+848等于几

　"621-382等于几"...621-382等于几

　"621+21等于几"...621+21等于几

　"624+331等于几"...624+331等于几

　"632-416等于几"...632-416等于几

　"621-295等于几"...621-295等于几

　"624+531等于几"...624+531等于几

　"612-427等于几"...612-427等于几