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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
2b的值为( ) A.3ab 6a 6ab 5ab
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
3x2﹣x2=3 a+b=ab 3+x=3x ﹣ab+ba=0