www.ylrr.net > 解方程.①x:24=24:16② 1 2 x+ 3 ...

解方程.①x:24=24:16② 1 2 x+ 3 ...

①baix:24=24:16 16x=24*24,du 16x=576, 16x÷zhi16=576÷16, x=36;dao② 1 2 x+ 3 8 x=28, 7 8 x=28, 7 8 x÷ 7 8 =28÷ 7 8 , x=32;③2x-1.65+2.35=7,2x-1.65+2.35-2.35=7-2.35, 2x-1.65=4.65,2x-1.65+1.65=4.65+1.65, 2x=6.3, 2x÷2=6.3÷2, x=3.15.

①x:24=24:16 16x=24*24, 16x=576, 16x÷16=576÷16, &

①∵(±4) 2 =16, ∴x+1=±4, ∴x=3或x=-5; ②∵(x+3) 3 =-27, ∴x+3=-3, ∴x=-6.

(1)去分母得:3(x+2)-2(2x-1)=12,去括号得:3x+6-4x+2=12,移项合并得:-x=4,解得:x=-4;(2)x?2y=5① 2x+3y=4② ,由①得:x=2y+5,代入②得:4y+10+3y=4,解得:y=-6 7 ,将y=-6 7 代入得:x=23 7 ,则方程组的解为x=23 7 y=?6 7 .

①3 4 x÷1 6 =243 4 x÷1 6 *1 6 =24*1 6 3 4 x=43 4 x÷3 4 =4÷3 4 x=16 3 ②3x-12.8*3=0.06 3x-38.4=0.06 3x-38.4+38.4=0.06+38.4 3x=38.46 3x÷3=38.46÷3 x=12.82③3 10 -21*2 3 =73 10 x-14=73 10 x-14+14=7+143 10 x÷3 10 =21÷3 10 x=70

①6X÷ 3 4 =24, 6X=24* 3 4 , 6X=18, X=3;②X+ 3 5 X= 16 17 , 1 3 5 X= 16 17 , X= 16 17 ÷ 8 5 , X= 10 17 ;③ 4 5 X-18* 2 3 =4, 4 5 X-12=4, 4 5 X=16,X=20.

①x+2/4-2x+1/3=1 x-2x=1-2/4-1/3 -x=1/6 x=-1/6②x+1-x=2+x-2/3 -x=1/3 x=-1/3③1/6(2x+1)=1/2-1/3(x-5) 2x+1=3-2x+10 4x=12 x=3 ④x+4/5-(x-5)=x+3/3-x-2/2 x=24/5

①去分母得:-24+(x+1)(x+3)=x2-9,去括号得:-24+x2+4x+3=x2-9,移项合并得:4x=-12,解得:x=-3,经检验x=-3是增根,分式方程无解;②方程变形得:13(1x-1x+3+1x+3-1x+6+1x+6-1x+9)=32(x+9),即1x-1x+9=92(x+9),去分母得:2(x+9)-2x=9x,解得:x=2,经检验x=2是分式方程的解.

①X+3X=-16 解:4X=-16 X=-4 ②16y-2.5y-7.5y=5 解:6y=5 y=6/5 ③3x+5=4x+1 解:X=4 ④9-3y=5y+5 解:8y=4 y=0.5

(1) X-2〔X-3(X+4)-6〕=1 x-2x+6(x+4)+12=1-x+6x+24+12=15x=-35 x=-7(2)7-2{3〔4(X-1)-8〕-20}=117-6[4(x-1)-8]+40=117-24(x-1)+48+40=117-24x+24+48+40=11119-24x=1124x=108 x=4.5

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