P44/8,把(x-1)当做一个整体,合并3(x-1)²-2(x-1)³-5(1-x)²+4(1-x)³的结果是( ).
问题描述:
P44/8,把(x-1)当做一个整体,合并3(x-1)²-2(x-1)³-5(1-x)²+4(1-x)³的结果是( ).
P44/9,把(m-n)当做一个整体,合并(m-n)²+2(m-n)-1/3(n-m)²-3m+3n的结果是( ).
P46/22,已知x=3时,代数式ax³+bx+1的值是-2009,求x=-3时代数式的值.
答
P44/8,把(x-1)当做一个整体,合并3(x-1)²-2(x-1)³-5(1-x)²+4(1-x)³的结果是( -2(x-1)²-6(x-1)³).3(x-1)²-2(x-1)³-5(1-x)²+4(1-x)³=3(x-...