若a+b=5,ab=4则2a-4ab+2b?

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若a+b=5,ab=4则2a-4ab+2b?若a+b=5,ab=4则2a-4ab+2b?若a+b=5,ab=4则2a-4ab+2b?2a-4ab+2b=2(a+b)-4ab=2*5-4*4=-6原式=

若a+b=5,ab=4则2a-4ab+2b?
若a+b=5,ab=4则2a-4ab+2b?

若a+b=5,ab=4则2a-4ab+2b?
2a-4ab+2b=2(a+b)-4ab=2*5-4*4=-6

原式 = 2 a + 2 b - 4 a b
= 2（a + b）- 4 a b
当 a + b = 5 ， a b = 4 时，原式 = 2 × 5 - 4 × 4
= 10 - 16
= - 6

2（a+b）-4ab
=10-16
=-6

5*2-4*4=-6

2a+2b-4ab
2(a+b)-4ab
2x5-4x4=-6

若a+b=5,ab=4则2a-4ab+2b? 若a+b=4,ab=5,则-2a²b-2ab² 若a+b=3,ab=-2,求(5a-5b-ab)-(4a-6b-3ab) 如a-b=4,ab=1,则(2-ab+2a+5b)-(3ab+2b-2a)-(3a+4b-ab)= 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=? 若a-b=4,ab=-2则2a^2b-2ab^2 若a+b=3,ab=-2,则(4a-5a-3ab)-(3a-6b+ab)=? 若a^2+ab=3,ab+b^2=4,则a^2+2ab+b^2等于多少若a+b=4ab 则代数式2a-ab+2b/2ab值为? 若a+b=4ab,则代数式（2a-ab+2b）/2ab的值为? 若a+b=4ab,则代数式2ab分之2a-ab+2b的值为. 已知a+b=-4,ab=-5,则2（ab-3a)-3(2b-ab)的值为若a+b=3,ab=-2,则(4a-5b-3ab)-(3a-6b+ab)= 若a+b=3,ab=-2,则(4a-5b-3ab)-(3a-6b+ab)= 若a+b=3,ab=-2,则（4a-5b-3ab）-（3a-6b+ab）=（）若a+b=3,ab=-2,则（4a-5b-3ab)-(3a-6b+ab)= a-b/ab=4,则a-2ab-b/2a-2b+7ab=? 已知（a-b）/ab=4,则a-2ab-b/2a-2b+7ab=?