"455-255除以5等于几"...455-255除以5等于几

　"450-250除以5等于几"...450-250除以5等于几

　"455除以56等于几"...455除以56等于几

　"545+285除以5等于几"...545+285除以5等于几

　"465+205除以5等于几"...465+205除以5等于几

　"525除以44等于几"...525除以44等于几

　"525-480除以15等于几"...525-480除以15等于几

　"250除以5+49等于几"...250除以5+49等于几

　"455除以35等于几"...455除以35等于几

　"5540除以45等于几"...5540除以45等于几