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ΔXAB=DAB²sinαAB ΔXAB=DAB²cosαAB ΔYAB=DAB²sinαAB ΔYBA=DBA²cosαAB
pH＝pHNR,SB＝AB pH＞pHNR,SB＜AB pH＜pHNR,SB＞AB pH＜pHNR,SB＜AB pH＞pHNR,SB＞AB
3x－5x=2x 3x2+x=4x3 －7a+4b=-11ab －3ab2－ab2= －4ab
pH＝pHNR,SB＝AB pH＞pHNR,SB＜AB pH＜pHNR,SB＞AB pH＜pHNR,SB＜AB pH＞pHNR,SB＞AB
2PA＋2PB PA＋AB＋PB PA＋PB－AB 2PA＋PB－AB
2b的值为（ ） A.3ab 6a 6ab 5ab
pH＝pHNR、SB＝AB pH＞pHNR、SB＜AB pH＜pHNR、SB＞AB pH＜pHNR、SB＜AB pH＞pHNR、SB＞AB
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
(AB/2)^(1/2) (2/AB)^(1/2) (AB/2) ² (2/AB) ²
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