Odpowiedzi

2009-12-08T16:51:01+01:00
1.
6-(5-x)-4x=
6-5+x-4x=
1-3x

1-3×(-2)=
1-(-6)=
1+6=
7

2.
8z-2(5z+6)+7z-4=
8z-10z-12+7z-4=
5z-16

5×¾-16=
3¾-16=
12¼

3.
4p-2(8-p²)+5p²-p=
4p-16+2p²+5p²-p=
3p-16+7p²

3×½-16+7×½²=
1½-16+7×¼=
1½-16+1¾=
1,5-16+1,75=
13,25

4.
(x+y)-(x-y)=
x+y-x+y=
2y

2×(-0,5)=
-1

5.
0,7a²-1,2b²-9,9c⁴=
0,49a²-1,44b²-2890,08c⁴

0,49 × (-1)² - 1,44 × 7² - 2890, 08 × 0²=
0,49 × 1 - 1,44 ×49 - 2890,08 × 0=
0,49 - 70,56 - 0=
-70,07