1. -9(x-2)-y(x-5)
å½x=5,y=12æ¶,æ±å¼åçå¼.
2. 5(9+a)Ãb-5(5+b)Ãa
å½a=5/7æ¶,æ±å¼åçå¼.
3. 62g+62(g+b)-b
å½g=5/7,b=16æ¶,æ±å¼åçå¼.
4. 3(x+y)-5(4+x)+2y
å½x=9,y=2æ¶,æ±å¼åçå¼.
5. (x+y)(x-y)
å½x=0.45,y=0.65æ¶,æ±å¼åçå¼.
6. 2ab+aÃa-b
å½a=8.2,b=0.2æ¶,æ±å¼åçå¼.
7. 5.6x+4(x+y)-y
å½x=0.25.y=8æ¶,æ±å¼åçå¼.
8. 6.4(x+2.9)-y+2(x-y)
å½x=12,y=0.2æ¶,æ±å¼åçå¼.
9. (2.5+x)(5.2+y)
å½x=2.3,y=5.1æ¶,æ±å¼åçå¼.
10. (2x-3xy+4y)+(x+2xy-3y)
å½x=2.y=3.5æ¶,æ±å¼åçå¼.
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