《解方程》练习题
(1)
5
3 χ+2.4χ=6 (2)3.5: χ=5:4.2 (3)1.8χ-χ=2.4 (4)
x
10 =
8.0
5.2
(5)6×3-1.8χ=7.2 (6)17-5χ=2.4+3
5
1 (7)
4
x =
5
2.1 (8) χ-
4
1 χ=
8
3
(9)12.6×
6
5 -2χ=8 (10)
2.1
x =
6.0
5.1 (11)
5
3 ×
2
1 -χ=
5
1 (12)
3
2 χ+50%=42
(13)4χ-13=31 (14)4.5+8χ=27
2
1 (15)2χ+4.3×3=14
2
1 (16) χ×(1-
8
3 )=1
(17)χ-
4
1 χ=
8
3 (18)3
2
1 ÷4χ=2.5 (19)
4.0
x =
6
5.1 (20)1.6:χ=
5
2 :
10
3
(21)3χ-16×3=102 (22)x:1
9
7 =
20
1 :
3
1 (23)4χ+7.1=12.5 (24)χ:0.6=
3
1 :4
(25)
3
2 :
7
3 =
9
7 :χ (26) 0.3χ-2=9.1 (27)
7
x =
5.3
6.0 (28)
2
1 x-
4
1 =
8
1
(29) χ:
2
1 =
4
1 :
8
1 (30)
2
1 : χ=
4
1 :
8
1 (31)3χ+
4
1 χ=2
13
2 (32)
14
5 :
7
5 =0.3: χ
(33)131-χ=89.2 (34)
3
1 :0.25=80%: χ (35)4χ+7.1=12.5 (36)
4
3 -
2
1 χ=
5
1
(37)
3
2 χ-
2
1 χ+
5
1 =
3
2 (38)
4
3 :
5
3 =χ:12 (39) χ-
2
1 χ=
10
7 (40) χ:
4
3 =12:3
(41)2.4χ-0.45×2=0.3 (42)
4
1 :
8
1 =χ:0.1 (43)6.3-5χ=4.1 (44)1.25:5=0.75:χ
(45)
2
1 :χ=
4
3 :6 (46)
5
3 ×2.5-χ=0.6 (47)χ-
6
1 χ=
12
5 (48)
3
1 : χ=
5
1 :
7
6
(49)
10
x =
2
1.0 (50)
3
2 χ-
2
1 χ+1.2=3.4 (51)4:6=15:χ (52)
2
1 :
4
3 =χ:
3
2