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x4·x4=x16 (a3)2·a4=a9 (ab2)3÷(-ab)2=-ab4 (a6)2÷(a4)3=1
3a+4b=7ab 7a-3a=4 3a+a=3a2 3a2b-4a2b=-a2b
3a+4b=7ab (ab3)3=ab6 (a+2)2=a2+4 x12÷x6=x6
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
x4·x4=x16 (a3)2·a4=a9 (ab2)3÷(-ab)2=-ab4 (a6)2÷(a4)3=1
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
(a+b)(a+2b)=a2+3ab+2b2 (3a+b)(a+b)=3a2+4ab+b2 (2a+b)(a+b)=2a2+3ab+b2 (3a+2b)(a+b)=3a2+5ab+2b2
3a﹣a=2 ﹣42=﹣16 3a+b=3ab ﹣5﹣2=﹣3
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
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
2a+3b=5ab (﹣1)0=1 (ab3)2=ab6 (x+2)2=x2+4
3a-a=2 -42=-16 3a+b=3ab -5-2=-3