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