1.25×8b =
3a + 0.8a =
m + 5m - 2m =
15y - 1.5y =
2.1×3x =
0.5×2 + y =
2.5×3m =
13×6m =
2.5×4×y =
4a + 5.6a =
6.1x + 3.2x =
3(m + 5) =
2.2y - 0.8y =
m×18 =
5×4÷5×y =
3a + 0.8a =
m + 5m - 2m =
15y - 1.5y =
2.1×3x =
0.5×2 + y =
2.5×3m =
13×6m =
2.5×4×y =
4a + 5.6a =
6.1x + 3.2x =
3(m + 5) =
2.2y - 0.8y =
m×18 =
5×4÷5×y =
答案
1. 10b 3.8a 4m 13.5y 6.3x 1+y 7.5m 78m 10y 9.6a 9.3x 3m+15 1.4y 18m 4y
2.86÷11= 
4.25×38=
7.15÷65=
3.6×67=
62.9÷74=
4.19×53=
15÷6=
3.05×4=
28.7÷14=
4.25×38=
7.15÷65=
3.6×67=
62.9÷74=
4.19×53=
15÷6=
3.05×4=
28.7÷14=
答案
2. 0.26 161.5 0.11 241.2 0.85 222.07 2.5 12.2 2.05
(竖式略)
(竖式略)
字母推理如果☆、、
分别表示三个不同的数,并且
+
=☆,☆+☆=,+-3=13,那么
=(
=(
=(
4
),8
),2
)。答案
3. 4 8 2
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