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2s22p2和2s22p4 3s23p4和2s22p4 3s2和2s22p5 3s1和3s23p4
-2ab2+4a2b=2ab(-b+2a) 3m(a-b)-9n(b-a)=3(a-b)(m+3n) -5ab+15a2bx+25ab3y=-5ab(-3ax-5b2y); 3ay2-6ay-3a=3a(y2-2y-1)
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
3a+4b=12a (ab3)2=ab6 (5a2﹣ab)﹣(4a2+2ab)=a2﹣3ab x12÷x6=x2
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
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
A2+3B22AB3 2AB2+B22AB3 2A2B.+5B24AB3 2AB2+B22AB3
2+a=2a 2a﹣3a=﹣1 (﹣a)2•a3=a5 8ab÷4ab=2ab
x2y﹣2x2y=﹣x2y 2a+3b=5ab 7ab﹣3ab=4 a3+a2=a5