解方程 n(n-3)=270
解方程 n(n-3)=270
說明每步原因
怎么到(n-18)(n+15)=0看不懂,請講解
說明每步原因
怎么到(n-18)(n+15)=0看不懂,請講解
數(shù)學(xué)人氣:599 ℃時(shí)間:2020-10-01 22:58:06
優(yōu)質(zhì)解答
n(n-3)=270由于該式無法運(yùn)算,故轉(zhuǎn)化為n^2-3n-270=0,把它因式分解(n-18)(n+15)=0,兩個(gè)數(shù)的乘積為0,那么兩個(gè)數(shù)至少有一個(gè)為0,即n-18=0或n+15=0.這樣就得答案n=18/-15.把一個(gè)多項(xiàng)式化為幾個(gè)最簡整式的積的形式,這種變...
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