1、解方程7 简 易 方 程三简 易 方 程(三)例题1、(1)3(X7)5(X4)15 (2)8(X3)5X27 (3)60.6(X0.6)0.6 (4)5.22(X4)5(5)3.537X67.9 (6)2(2.8X)10.4(7)3(X3)1.8 (8)0.4X1.80.1X4.5例题2、(1)7X34X6 (2)3.4X9.81.4X9(3)2X5258X (4)1.5X0.52.5X0.5 (5)4x62212x (6)7x27=133x (7)12X1028X (8)23x +19=39+3x 例题3、(1)6x=15(x0.6) (2)8(X3)4X1(3)5(2x )=3x + 7
2、 (4)8(5X17)8X8例题4、(1)5(X2)2(2X7) (2)6(2X7)5(X7)(3)3(X0.9)5(X1.7) (4)5(3X1.4)2(6X0.5)课堂练习:解下列方程:(1)3X1536 (2)172x5(3) 6x846 (4)X3414(5)X9783 (6)10X4(7)3X164118 (8)X0.8X919(9)11262X3.2 (10)X0.8X616(11)(3X2)42X7 (12) (4X14)(X2) 5(13)15(5.5X)62X (14)(5.3x5)7x8(15)46(3X2)16X (16)(13X8)35X1(17)5.5x21x504.5x11 (18)305x7x24(19)16x64x214x1210x (20)5x34=3x54 (21)18(5x9)18x18 (22)15(75x)2x(113x)(23)2(3x4)7(4x)4x (24)5x2.60.43x1.8(25)252x=5+2x (26) 5.4+4.8x=1.8x+6(27)184x=2x6 (28)8(x-1)=7(x+3) (29)3(x+2) = 4(x+1) (30)2(3x )=3(62x )(31)7(x+6)3x=4(2x +5) (32)5(2x )=3x + 7