WYRAŻENIA ALGEBRAICZNE ;
1) -2(4+x)= -(-4x+7)+5 =
2) 5x-1 = 2x+3 =
3) 1/2 + 2/3 - 0,25 - 1/8 =
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1) 1/2 + 2/3 - 0,25 - 1/8 =
2) 7/8 ; 5,6 - 31/4 * 0,2 =
3) -5-2(x+4) =-(7-4x)
5) 2x+3 = 5x -1
WSZYSTKIE ZŁE ROZWIĄZANIA, BĘDĄ ZGŁASZANE.
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1) -2(4+x)= -(-4x+7)+5 =
= -8-2x=4x-7+5=
=-2x-4x=-7+5+8=
= -6x=6 | : (-6)
x= -1
2) 5x-1 = 2x+3 =
= 5x-2x=1+3
=3x=4 | : 3
x= 4/3= 1 1/3
3) 1/2 + 2/3 - 0,25 - 1/8 =
=1/2+2/3-1/4-1/8=
= 12/24+16/24-6/24-3/24=19/24
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1) 1/2 + 2/3 - 0,25 - 1/8 =
=1/2+2/3-1/4-1/8=
= 12/24+16/24-6/24-3/24=19/24
2) 7/8 ; 5,6 - 31/4 * 0,2 =
= 0,875:5,6-31/4 * 2/10=
=0,15625-31/4* 1/5=
=0,15625-31/20=
= 0,15625- 1,55=-1,39375
3) -5-2(x+4) =-(7-4x)=
= -5-2x-8=-7+4x=
= -2x-4x=-7+5+8=
=-6x=6 | (:-6)
x= -1
5) 2x+3 = 5x -1=
= 2x-5x=-1-3=
= -3x= -4 | :(-3)
x=4/3=1 1/3