(x+3y)*(x-3y)-x^2 упростить
(x+3y)(x-3y)-x^2=x^2-9y^2-x^2=-9y^2
х+3у* х-3у - х:2
1х:1х+1х= -3у+3у:2
2х=0
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(x+3y)(x-3y)-x^2=x^2-9y^2-x^2=-9y^2
х+3у* х-3у - х:2
1х:1х+1х= -3у+3у:2
2х=0