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Ativ minha 7ª serie 2011

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  • 1. Colégio estadual Dinah GonçalvesProfessor Antonio Carlos Carneiro BarrosoEquações fracionáriasSérie 7ª ou 8º anoaccbarroso@hotmail.comHTTP://ensinodematemtica.blogspot.comHTTP://accbarroso60.wordpress.com Atividade para 7ª sérieou 8º anoResolva: x−2 x−3 3a) + = 4 2 23( x − 2 ) 6( x − 3) 18 + = 12 12 123x-6 +6x-18=183x+6x-6-18=189x=18+18+69x=42 42X= 9 x −1 x − 5 3 + = 2 3 6b) 3( x − 1) + 2( x − 5) = 3 mmc 6 6 6 63x-3+2x-10=33x+2x-3-10=35x=3+10+35x=16 16X= 5
  • 2. x−2 x−5 5 + = 8 3 2c) 3( x − 2) 8( x − 5) 60 mmc 8,3,2=24 + = 24 24 243x-6+8x-40=603x+8x-6-40=6011x=60+6+4011x=106 106X= 11 2 x − 3 3x − 4 5 + = 2 8 4 4( 2 x − 3) 1( 3 x − 4 ) 10 + = 8 8 8 8 x − 12 + 3 x − 4 = 10d) 8 x + 3x − 12 − 4 = 10 11x = 10 + 4 + 12 11x = 26 26 x= 11 x − 5 x −1 4 5( x − 5) + 2( x − 1) = 4e) + = mmc 10 /5x-25+2x-2=4 2 5 10 10 315x+2x=4+25+2 / 7x=31 / x= 7 x−7 x−4 7 4( x − 7 ) + 3( x − 4 ) = 42f) + = mmc 24 / 4x-28+3x-12=42 / 6 8 4 24 824x+3x=42+12+28 /7x=82 / x= 7 x−2 x−4 5 2( x − 2) + 6( x − 4 ) = 45g) + = mmc 18 / 2x-4+6x-24=45 / 9 3 2 18 732x+6x=45+24+4 /8x=73 / x= 8
  • 3. 2x − 1 2x − 3 5 2( 2 x − 1) + 4( 2 x − 3) = 15h) + = mmc 24 / 12 6 8 24 294x-2+8x-12=15 /4x+8x=15+12+2 /12x=29 /x= 12 3x − 4 2 x − 1 5 4( 3x − 4 ) + 7( 2 x − 1) = 70i) + = mmc 28 / 7 4 2 28 9312x-16+14x-7=70 /12x+14x =70+7+16 / 26x= 93 / x= 26 x−4 x−3 5 8( x − 4 ) + 9( x − 3) = 90j) + = mmc 72 / 9 8 4 72 1498x-32+9x-27=90 /8x+9x=90+27+32 / 17x =149 / x = 17 x−7 x−4 3 8( x − 7 ) + 5( x − 4) = 30j) + = mmc 40 / 8x 5 8 4 40-56+5x-20=30 / 8x+5x = 30+20+56 / 13x =106 106/x= 13 x−2 x−3 3 2( x − 2) + 8( x − 3) = 3l) + = /mmc=16 / / 2x-4+8x-24 8 2 16 16=3 /2x+8x =3+4+24 /10x=31 31x= 10 2 x − 1 3x − 2 8 5( 2 x − 1) + 4( 3 x − 2 ) = 80m) + = mmc=20 / / 4 5 2 2010x-5+12x-8=80 9310x+12x=80+8+5 / 22x=93 /x= 22 2( x − 1) 3( x − 4) 5 8( x − 1) + 30( x − 4 ) = 5n) + = / mmc=20 / / 5 2 20 208x-8+30x-120=5 1338x+30x=5+120+8 / 38x=133 / x= 38 2 x + 1 3x + 4 3 8( 2 x + 1) + 5( 3x + 4 ) = 60o) + = / mmc40 / / 5 8 2 4016x+8+15x+20=60
  • 4. 3216x+15x=60-20-8 /31x=32 / x= 31 x−5 x−2 7 4( x − 5) − 3( x − 2) = 42p) − = / mmc 12 / / 3 4 2 124x-20-3x+6=424x-3x=42-6+20 / x=56 2− x x−5 4 4( 2 − x ) + 6( x − 5) = 12q) + = / mmc 24 / / 6 4 8 248-4x+6x-30=12-4x+6x=12+30-8 / 2x = 34 / x=34:2 / x= 17

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