1、解方程:
518+X =
211112 2X–
19 =
3X–1.4×2=1.1
37X+–=
17 5.5x–3x = 1.75 X+ =
321858X = 40 X+27X = 18
X×(1+
14)= 25 X×23 = 8×34 XX×
34×
25 = 18 X×27 = 18×13
X+14x = 20 计算下面各题:
[1–(1314+8)]÷8 17÷23×7
25÷(758–6)
[1–(124+5)]÷3.5 X÷
23 =
56 12X = 15×3255 X1–
5)X =
15 ×287 =
21 15X×
9110 = 24×8 X3 = 10 7X14×x+15×45 = 12
1–
54912×5÷3 111512–(9+
12)
8+2–31534 (3118+3+4 [(11
510X–
3=
14X 8 ×(1136+38)=
12
X×
45×
18 = 10
÷X = 56
X×
13×
35 = 4
–4X = 21
(1–1276×5)÷9
4125×34–
50
5–3)÷(23+49)
–3)×253]÷4
( 151153127×[3÷(2+6)] 12÷(1–7) [(1–6×5)÷9
32423142311[(1–)×]÷4 8–÷× ×–÷
5576562(
5–
3)÷
2 (
1+
1)÷(1–
3)
1÷3+
4×
192384+2+
511119718÷2 72×(2–3+4) 2+
67×
233453+
7
8+
5×
6+
13 4–
8÷2–18321535 9×(9+4)–3 4+51183158÷4+2 2–9×4–3 3078+24153÷5+6 6–
12×
910–
138
12×(1–11143523+4) 5+9×8+6 448×(111663–2+4)
25÷9+
25× 24(
3115+
4)×60–27 5–
6–
56 97×
53396 5×8+5×2 15(8+394–
21113)×72 72×(2–3+
4) (30×(1–1+112714236)
7×(6+
3)
(1.6+1.6+1.6+1.6)×25 (4+
5796-18)÷
136 2
553–2÷4135–6
1657×
11+
11÷7
728÷713+8×2
×(1+25–162)41913×5+
13÷5
–2815÷
15–4×(116+8)
(
15–
17)×70
×37+15×47
5149+
13)×9+
137÷5+1185×
111872510017
12.3-2.45-5.7-4.55
4.2×87+0.2×1300 78×36+7.8×741-7
784579÷2+
51511×
29 0.125×0.25×
1321×17+
1712×8
×
12+0.125×
12+0.5 2.42÷
34+4.58×1-4÷3
31、 25÷100
2526 4.25-3
56-(2
16-1
34) 3.8÷3.9+3.9÷0.1+0.1÷3.9
3