一、解方程。姓名:
3X= X÷=12
5
÷X=
3
10
25% X + 15%X =
=30% X = X-0.25= 50% X + X = 3.6
X×=20× X - 15%X = 68 X-2
7
X = X+X=121
X+X= X + X = 4 X+X=20 4X-6×=2
6X+5 =13.4 4 X-6=38 X+= X - 0.8 X = 16+6
4 X-3 ×9 = 29 5X-3×= 0.36×5- 3
X =
3
4+0.7X=102
2 3 ( X - 4.5) = 7 X÷=12 2(X-2.6)=8
2
5
X-
1
3
X=
3
10
X×( 1
6
+
3
8
)=
13
12
X-0.375 X =20 X– 8.5= 1.5
1
2
X - 25% X = 10
X - 4
5
X -4= 21
二、简便运算。
(
7
12
-
1
5
)×60 36×
34
35
0.65×101
(1.25-0.125)×8 253
8
×8 24×(---)
(12+) ×7 13×10.2 2.6×99
4 7×
6
13
+
3
7
×
6
13
27.5×3.7-7.5×3.7 ÷+×
7 10×101-
7
10
3
5
× 99 +
3
5
×-÷
×103-×2- 0.92×1.41+0.92×8.59
2.25×4.8+77.5×0.48 4.8×7.8+78×0.52 1.3×11.6-1.6×1.3
2 27×(15×
27
28
)×
2
15
4.36×12.5×8 2.5×32×1.25
1.25÷×0.8 9.6÷3.2÷3 15.2÷0.25÷4
8 9×
8
9
÷
8
9
×
8
9
×3÷×3 146.5-(23+46.5)
12.89-(3.89-1.6) 73.8-1.64-13.8-5.36 15.75+3.59-0.59+14.25
5.48-(9.4-0.52) 12.06+5.07+2.94 30.34+9.76-10.34