October 2018 1 17 Report

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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