用單項(xiàng)式去乘多項(xiàng)式的每一項(xiàng),再把所得的積相加.例計(jì)算解原式=注意:在運(yùn)算中要注意系數(shù)相乘(特別是符號(hào)).例化簡(jiǎn)x(x2+3)+x2(x-3)-3x(x2-x-1)解原式=x3+3x+x3-3x2-3x3+3x2+3x =-x3+6x.注意:上題中的-3x(x2-x+1),要用(-3x)分別乘多項(xiàng)式的各項(xiàng). (本文共 155 字 ) [閱讀本文] >>
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 用單項(xiàng)式去乘多項(xiàng)式的每一項(xiàng),再把所得的積相加.例計(jì)算解原式=注意:在運(yùn)算中要注意系數(shù)相乘(特別是符號(hào)).例化簡(jiǎn)x(x2+3)+x2(x-3)-3x(x2-x-1)解原式=x3+3x+x3-3x2-3x3+3x2+3x =-x3+6x.注意:上題中的-3x(x2-x+1),要用(-3x)分別乘多項(xiàng)式的各項(xiàng). (本文共 155 字 ) [閱讀本文] >>