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 = 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=?