Question

Proszę o zrobienie tych zadań chociaż kilka .
Pilnie

Answer 1

Zad. 3
8:2 = 4cm
Pole:
P = πr²
P = π 4²
P = 16π

Obwód:
O = 2πr
O = 2π4
O = 8π

Zad 4
O = d * π
O = 20π = 20 * 3 = 60cm
240km - 240000m - 24000000cm
24000000cm : 60cm = 400000

Zad. 5
1+4 =5 41-14 = 27
2+3= 5 32-23=9
Liczba pięter to 14

Zad 6
y = 20+x

Zad. 7
2x + y = 11
3x - y = 9
5x = 20 /5
x = 4

2x +y =11
2 * 4 + y = 11
8 + y = 11
y = 11 - 8
y = 3

x=4
y=3

8.
4x + y = 5 /*3
2x - 3y = 13

12x + 3y = 15
2x - 3y = 13
14x = 28
x = 2

4x + y = 5
4 * 2 + y = 5
8 + y = 5
y= 5-8
y = -3

x = 2
y=-3