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5a+2a=7a2 5a﹣2b=3ab 5a﹣2a=3 ﹣ab3+2ab3=ab3
5a2﹣3a2=2 2x2+3x2=5x4 3a+2b=5ab 7ab﹣6ba=ab
3x-5x=2x 3x2+x=4x3 -7a+4b=-11ab -3ab2-ab2= -4ab
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2a+3b=5ab 7ab-3ab=4
A2+3B22AB3 2AB2+B22AB3 2A2B.+5B2==4AB3 2AB2+B2==2AB3
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
19a2b﹣9ab2=10ab 3x+3y=6xy 16y2﹣9y2=7 3x﹣4x+5x=4x
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
3a+4b=7ab (ab3)2=ab6 (a+2)2=a2+4 x12÷x6=x6
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
7a+a=7a2 -2a+8b=6ab -4m2n-2m2n=-6m2n 3ab2-5b2a=2ab2
3a-2a=l a2 +a5 =a7 (ab)3一ab3 a2· a4 =a6
(a3)2=a5 a2+a5=a7 (ab)3=ab3 a2•a5=a7