解:[(3x+2y)?+(x+2y)(x-2y)]÷2x [(3x+2y)?+x?-4y?]÷2x (9x?+4y?+12xy+x?-4y?)÷2x (10x?+12xy)÷2x ∵ x=2,y=5/6 ∴原式=(10*4+12*2*5/6)÷4 =(40+20)÷4 =15
回到顶部