Question

Sprawdź równania ;

a ] 2(z - 7) = 3(z - 2) ... dla `z` = -2
L= 2(-2 - 7 ) = .. ?
P= 3(-2 - 2) = .. ?

b ] 2(3x + 2) - 5x = 8 ... dla `x` = 4
L= 2 ( 3 x 4 + 2 ) - 5 x 4 = .. ?

c] 3x - (7 - x ) = 4 + x
L= 3 x (-3) x(7 - [-3] = .. ?
P = 4 + x .. ?


we wszelkich nietykach oznaczam że `x` w działaniu oznacza `razy` .

Answer 1

A ] 2(z - 7) = 3(z - 2) ... dla `z` = -2
L= 2(-2 - 7 ) = -4-14=-18
P= 3(-2 - 2) = -6-6=-12

b ] 2(3x + 2) - 5x = 8 ... dla `x` = 4
L= 2 ( 3 x 4 + 2 ) - 5 x 4 = 6 x 8+4-20=48+4-20=32

c] 3x - (7 - x ) = 4 + x
L= 3 x (-3) x(7 - [-3] =9 x -10= -90
P = 4 + x=8

Answer 2

a ] 2(z - 7) = 3(z - 2) ... dla `z` = -2
2 * (-9) = 3 * (-4)
-18 = -12
L= 2(-2 - 7 ) = -4 - 14 = -18
P= 3(-2 - 2) = -6 - 6 = -12

b ] 2(3x + 2) - 5x = 8 ... dla `x` = 4
2 * 14 - 20 = 8
28 - 20 = 8
L= 2 ( 3 x 4 + 2 ) - 5 x 4 = 2 * 14 - 20 = 28 - 20 = 8

c] 3x - (7 - x ) = 4 + x
4x - x = 4 + 7
3x = 11/:3
x = 11/3
L= 3 x (-3) x(7 - [-3] = -9 * 10 = -90
P = 4 + x = 8

Answer 3

A]
L= 2(-2-7)= -4-14= -18
P= 3(-2-2)= -6-6= -12
L=P
-18= -12

b]
L= 2(3x4+2)-5x4=2*14-20=28-20=8
P=8
L=P
8=8

c] 3x-(7-x)= 4+x
4x-x= 4+7
3x= 11/:3
x= 11/3
L= 3x(-3)x(7-[-3])= -9*10= -90
P= 4+x= 8
L=P
-90=8