1.45a²-30a+5
2. 81-(2x-3y)²
3.ab/a+3b/a X 5b+5/a+3除(ab+a) (simplify!!)
問數學題~~~~~
2006-12-05 4:08 am
回答 (3)
2006-12-05 5:11 am
3.ab/a+3b/a X 5b+5/a+3 / a(b+1)
=b(a+3)/a x (5ab+5+3a)/a / a(b+1)
=b(a+3)(5ab+5+3a)/a²(b+1)
１.(45+30,a^2+1)5並不是因式,所不要理它
75a^3+5
2.81-(2x-3y)(2x-3y),(2x-3y)和(2x-3y)都約了所以
=81
=b(a+3)/a x (5ab+5+3a)/a / a(b+1)
=b(a+3)(5ab+5+3a)/a²(b+1)
１.(45+30,a^2+1)5並不是因式,所不要理它
75a^3+5
2.81-(2x-3y)(2x-3y),(2x-3y)和(2x-3y)都約了所以
=81
2006-12-05 4:30 am
1. 45a²-30a+5 = 45a²-15a-15a+5 = 15a(3a-1)-(15a-5) = 15a(3a-1)-5(3a-1) = (15a-5)(3a-1) =5(3a-1)² 可能有錯...
參考: 自己
2006-12-05 4:28 am
Ans:
1. 5(3a-1)^2
2. (9+2x-3y)(9-2x+3y)
3. [(ab+15b^2)(b+1)+3]/(ab+a)
1. 5(3a-1)^2
2. (9+2x-3y)(9-2x+3y)
3. [(ab+15b^2)(b+1)+3]/(ab+a)
收錄日期: 2021-04-23 18:57:51
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