(1)(x+3)(x-2)-(x-2)2(2)(3x+4y)(3x-4y)(3)25-38+214(4)6013×5923.-数学

题目简介

(1)(x+3)(x-2)-(x-2)2(2)(3x+4y)(3x-4y)(3)25-38+214(4)6013×5923.-数学

题目详情

(1)(x+3)(x-2)-(x-2)2
(2)(3x+4y)(3x-4y)
(3)
25
-
38
+2
1
4

(4)60
1
3
×59
2
3
题型:解答题难度:中档来源:不详

答案

(1)原式=x2-2x+3x-6-(x2-4x+4)=x2+x-6-x2+4x-4=5x-10;
 
(2)原式=9x2-16y2;

(3)原式=5-2+2×class="stub"1
2
=3+1=4;

(4)原式=(60+class="stub"1
3
)(60-class="stub"1
3
)=3600-class="stub"1
9
=3599class="stub"8
9

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