试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)(﹣)×(﹣)2×(﹣)3;
(2)(y+2)(y﹣2)﹣(y﹣1)(y+5).
(1)(a3)2•(﹣2ab2)3
(2)a4•a4+(a2)4﹣(3x4)2 .
(x﹣1)÷(x﹣1)=1;
(x2﹣1)÷(x﹣1)=x+1;
(x3﹣1)÷(x﹣1)=x2+x+1;
(x4﹣1)÷(x﹣1)=x3+x2+x+1;
(x8﹣1)÷(x﹣1)=x7+x6+x5+…+x+1;
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