Question

Rozwiąż równania
a) 5y=13
b) 1/7x=-2
c) -7b=7/8
d) 7x +7=35
e) 1/2x+5=x+2
2 rozwiąż równainia
a) 97=2x-5
b)43=7+9x
c) 17=11-12x
d) 3i2/3 =1/2x-1/3

Answer 1

Zad 1
a) 5y=13/:5
y=2 i 3/5
b) 1/7x=-2/:1/7
x=-2*7/1 (bo mnozysz przez odwrotnosc)
x=-14
c) -7b=7/8
b=7/8/:7
b=7/8*1/7
b=7/56
b=8
d) 7x +7=35
7x=35-7
7x=28/:7
x=4
e) 1/2x+5=x+2
1/2x-x=-5
-1/2=-5/:(-1/2)
x=-5*(-2/1)
x=10
Zad 2
a) 97=2x-5
97+5=2x
102=2x/:2
x=61
b)43=7+9x
43-7=9x
36=9x/:9
x=4
c) 17=11-12x
17-11=-12x
6=-12x/:6
x=-2
d) 3i2/3 =1/2x-1/3
3i2/3+1/3=1/2x
4=1/2x/:1/2
x=4*2/1
x=8
Dasz naj ? ; )

Answer 2

1.
a) 5y=13 / ÷ 5
y = 1 i 2/13
b) 1/7x=-2 / × 7
x = -2 × 7
x = -14
c) -7b=7/8 / ÷ ( -7)
b = - 0,125
d) 7x +7=35
7x = 35 - 7
7x = 28 / ÷ 7
x = 4
e) 1/2x+5=x+2
½x - x = 2 - 5
-½x = - 3
x = 6

2.
a) 97 = 2x - 5
97 + 5 = 2x
102 = 2x /÷ 2
x = 51
b) 43 = 7 + 9x
43 - 7 = 9x
36 = 9x / ÷ 9
x = 4
c) 17 = 11 - 12x
17 - 11 = -12x
6 = -12x / ÷ (-12)
x = - 6/12
x = - ½
d) 3⅔ = ½x - ⅓
3⅔ - ⅓ = ½x
3 ⅓ = ½x / ÷ ½
10/3 × 2 = x mnożymy przez odwrotność!!!!!!
20/3 = x
6⅔ = x