問(wèn)答題設(shè)一元函數(shù)f(x,y0)與f(x0,y)分別在點(diǎn)x0處和y0處連續(xù),試問(wèn)此時(shí)二元函數(shù)f(x,y)回在點(diǎn)(x0,y0)處是否一定連續(xù)?反之,設(shè)f(x,y)在點(diǎn)(x0,y0)處連續(xù),能否證明f(x,y0)與f(x0,y)分別在點(diǎn)x0和y0處連續(xù)?

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