1、解方程(1) 3 +2.4 =65(2)3.5: =5:4.2(3)1.8 =2.4(4) 10 = 2.5x0.8(5)6 3 1.8 =7.2(6)17 5 =2.4+315(7) x = 1.24 5(8) 1 = 348(9)12.6 5 2=86(10) x = 1.51.20.6(11)3 1 = 1525(12) 2 +50%=423(13)4 13=31(14)4.5+8 =2712(15)2 +4.3 3=14 12(16) (1 3 ) 1283( 17) 1 348( 18)3 1 4 2.52( 19) x 1.50.46( 20 ) 1.6: 2 : 3510( 21
2、)3 163 102( 22 ) x:17 1 : 19203( 23 ) 4 7.1 12.5( 24 ): 0.6 1 : 43( 25 ) 2 : 3 7 : 379(26) 0.3 2 9.1(27) x 0.67 3.5(28) 1 x 1 12 48(29) : 1 1 : 1 2 4 8(30) 1 : 1 : 1248(31)3 + 1 2 25 : 5413(32) 0.3:147(33)131 89.2(34)1 :0.25 80 : 3(35)4 7.1 12.5(36)3 1 1425(37)2 1 1 23253(38)3: 3 :124 5(39) 1 = 72 10(40) : 3 =12:34(41)2.4 0.45 2=0.3(42) 1 : 1 = :0.148(43)6.3 5 =4.1(44)1.25:5=0.75:(45)1: = 3:624(46)32.5 =0.65(47) 1 = 56 12(48) 1 : = 1 : 6357(49) x =0.110 2(50) 2 1 +1.2=3.432(51)4:6=15: (52) 1 : 3= : 2243