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1、解方程练习一、解下列方程。x + 52 = 96x + 15=19.52x + 9=13.57.2 + 5x = 10x+8=132.5+x=5.3-2.7=13-40=15-1.6=1.4x + 5.3=10x + 2.5=363-25=2004-1.2=7425.5 + 3x = 56.44.65.4x = 12.70.6-6=300.15-3.8=8.50.8-6.4=z3.63-90.45=13.690.45 + 9x3=41.64x=505x=752x=4.65x=20.20.8x=4.55.4- + 57 = 189 0.45=202x=933.8x 1.8x=4.02x10=12
2、.52.5x=10(9-3x)6-x=41-0.85x=37x+3x + 26=74解比例:x: 10=-:-4 30. 4:x=l. 2:20 8: 4=x: 8-:x=3:1241.25:0. 25=xrl.636 = 54x 32 ux: -=6:324254J =_6_V 2245:x=18:262.8:4. 2=x: 9 61:x102.8:4. 2=x96x:24=-:= :8 61275-0.12o13 . 155 1 一 + 14 28 8 44- (1)7 1248( +2) -823- g 33 1(-)8475-0.1281215x5 + i14 28 8 47 248(
3、 +2) -83194 273 c 3 c7 8- 84455 7+ 112115丁【(3 5134天 X23 +425670.6120.6 : 4 = 2.4 : x1.5X3 1411 4 251112:5 = 36:讶=07:510 : 50=x: 40L 3 : x=52 : 20x: 3.6 = 6 : 181 1 164.6 83 x 3 , 20=9 * *调=;8 = 64解方程23- 7 x42X + | =570%X + 20%X = 3.625% + 10X=-5X - 15%X = 68X-=20iX+-X=12185X-3 A = 5217!=126X+5 =13.4
4、3X1X 3 2 一 7 一7 16X+-X=-4X-6-=23310X-1255 22 7=X3 - 5X1 - 6=X13一256 52 4-635X92=9X4=X1 - 6+X1 - 21 2x H x = 2042(x 2.6) = 8-X-21-=41036X+5 =1342135 x5 x=o4 x-6=38363Y = 45X=-8X=-xl=_15192115528lxr12 lx=li40. 7X=102-X+i=4232X+i=1054xA=26二 12X-0.25J-=30%35452544X-X=400X-0. 125X=88X=18 / 13 、 13XX( 6 +
5、 8 )12-0. 375x=-62 . 1 a- + -=432X - X = 1275 X-2.45 = 830. 36 5- x4(- 4. 5)1- 25%x = 10乙- 0. 8x16+620x - 8 5=1.54x- - x -4= 21X + 25%X=903x7X=23X- - X=-70%X 20%X3.6X-=20l25% + 10XX- 15%X = 68+ -X=12185X - 3 12216X+5 =13.43号|7?6l=l4X - 6 X=212T3x=w3 x =5726 = 26 1335 4525 二 L396514-3 X9 = 2921 X-=43
6、2(x-2.6) = 86X +5 =13.44x 6=385X=-19号X21151=124X二 4 _ 155 28lx3=572_6_=26 = 1335 45 , 25XX-0. 25=-4=30%40. 7X=102-X+l=4232-X=4008X+i1054X-0. 125X=8363X+y X=18f I + 3 .1368)12-0. 375x=-6=4-8X-X = 127335- 7 x = 7452 ,、鼻(- 4. 5) = 75 X2.4X5 = 80. 36 X25%X=90616-X8O-X8 - 9-X 3 - 53 - 7- -X 2 - 570%X + 2
7、0%X = 3.6+ 1OX =-5X - 15%X = 68A = 52173+L344 8X- =71-X- 25%x = 10乙20 x - 8. 5= 1. 523- 7 x4X-=20i54X+-X=12183X=x+ix44- - X52X +25%5X-34X-6X165 22 7=X3 - 5 二 6 二 26 13 35 45254-3 9 = 29X - 21 - =41032(x 2.6) = 86X+5 =13.4385X=-19152821154 x 6=xl-Xi=123435157296x3U35 4525X-0. 25=-4-=30%44+0. 7X=102-x+i X=4232x+7X=105X-X=400X-0. 125X=88X 43X+y X=180. 375x=-6w z 13 13XX ( 6 + 8 )=12xz 2 , 1 , sz 3x - + -=4 一3 285 = 875X-2. 4330. 36 5- - x =-452 /、 (- 4. 5) = 7o1 - 25%x乙二 10- 0. 8x = 16620 x - 8. 5= 1. 54- - x -4=21一、一般的方程:131、 2x x 15 x = 25442、 2x 3 = x+0.62