(1)3
5χ+2.4χ=6
(2)3.5: χ=5:4.2
(3)1.8χ-χ=2.4
(4)102.x=50.8
(5)6×3-1.8χ=7.2
(6)17-5χ=2.4+31
5
(7)x1.4=25
(8) χ-13
4χ=8
(9)12.6×5
6
-2χ=8
(10)x1.2=1.50.6
(11)35×12-χ=15
(12)2
3 χ+50%=42
(13)4χ-13=31
(14)4.5+8χ=271
2
(15)2χ+4.3×3=141
2
(16) χ×(1-32
8)=13
(17)χ-13
4χ=
8
(18)31
2
÷4χ=2.5 (19)x1.50.4
=6
(20)1.6:χ=
235:10
(21)3χ-16×3=102
(22)x:1711
9=20:3
(23)4χ+7.1=12.5
(24)χ:0.6=1
3
:4
(25)23:37=7
9
:χ
(26) 0.3χ-2=9.1
(27)x7=0.63.5
(28)12x-14=18
(29) χ: 12=14:1
8
(30)12: χ=14:18
(31)3χ+14χ=22
13
(32)514:5
7=0.3: χ
(33)131-χ=89.2
(34)1
3:0.25=80%: χ
(35)4χ+7.1=12.5
(36)314-2χ=15
(37)23χ-12χ+15=23 (38)34:3
5
=χ:12 (39) χ-12χ=710 (40) χ:
3
4
=12:3
(41)2.4χ-0.45×2=0.3
(42)14:1
8=χ:0.1
(43)6.3-5χ=4.1
(44)1.25:5=0.75:χ
(45)12:χ=34
:6
(46)3
5×2.5-χ=0.6
(47) χ-16χ=5
12
(48)13: χ=165:7
(49)x0.110=2
(50)23χ-1
2χ+1.2=3.4
(51)4:6=15:χ
(52)12:34=χ:23