rozwiąż równanie
a)
2/5 (x-2)=x+4
b)
3y-2(y-1)=-6
c)
3(3-5y)=90-5(3y-2)
d)
1/4z+(z-6)=2/3(z-2)
potrzebuję tego na jutro do szkoły dam najleprze noty dla tego kto to zrobi
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a)
2/5 (x-2)=x+4
2/5x - 4/5 = x + 4
2/5x - x = 4 + 4/5
-3/5x = 4 i 4/5
-3/5x = 24/5
x = 24/5 : (-3/5)
x = 24/5 * (-5/3)
x = - 8
b)
3y-2(y-1)=-6
3y - 2y + 2 = -6
y + 2 = -6
y = -6 - 2
y = -8
c)
3(3-5y)=90-5(3y-2)
9 - 15y = 90 - 15y + 10
-15y + 15y = 90 + 10 - 9
0y = 91
0 = 91 (fałsz)
równanie nie posiada rozwiazania
d)
1/4z+(z-6)=2/3(z-2)
1/4z + z - 6 = 2/3z - 4/3
1/4z + z - 2/3z = -4/3 + 6
3/12z + z - 8/12z = -4/3 + 18/3
1 i 3/12z - 8/12z = 14/3
15/12z - 8/12z = 14/3
7/12z = 14/3
z = 14/3 * 12/7
z = 8
a)2/5(x-2)=x+4
2/5x-4/5=x+4
2/5x-x=4+4/5
-3/5x=4⅘
x=-25/3=-8⅓
x=-8⅓
b)3y - 2 (y -1) = -6
3y-2y+2=-6
y=-8
c)3 (3-5y)=90 -5 (3y -2)
9-15y=90-15y+10
-15y=109-15y
-15y+15y=109
0≠109
d) 1/4z+z-6=2/3z-4/3
5/4z-6=2/3z-4/3
5/4z-2/3z=-6-4/3
15/12z-8/12z=-18/3-4/3
4/12z=-22/3
4/12z=-88/12 /:12
4z=-88 /:4
z=-22