1) Uprość wyrażenie i oblicz jego wartość dla x=1, y=-1
a) (x-2y) · (x+2y) - 2(x-y)²-4
b) (x²-3y)²+ (x+3y)²
2) oblicz
a) 7 ⅔- 6⅔ ·(0,3)²
b) [6³/₇- 5⁵/₇· 1,8] : [1:(½+ ⅙)]
c) (⅚+1½) : (⁵/₇- 1⅖)
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