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(ab)2=ab2 5a2﹣3a2=2 a(b+2)=ab+2 5a3•3a2=15a5
5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
x2y-2xy2=-x2y 2a+3b=5ab -3ab-3ab=-6ab a3+a2=a5
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
2a+3b=5ab (x+2)2=x2+4 (ab3)2=ab6 (﹣1)0=1
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2 5,则该反应的化学方程式为A. 2AB2 +B.2 == 2CB. 3AB2 +B.2 == 2C 4AB2 +B.2 == 2C AB2 + 4B2 == 2C
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
(AB/2)^(1/2) (2/AB)^(1/2) (AB/2) ² (2/AB) ²
2a+3b=5ab (﹣1)0=1 (ab3)2=ab6 (x+2)2=x2+4
2ab a2b a2b2 ab2