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1. 直接写出得数。
0.3+1.8=
5.9÷100=
1-0.08=
800×0.1÷20=
4.7-2.9=
3.05×30=
1.4×0.5b=
9.6÷0.3÷10=
1.3×20=
6.5÷13=
0.64÷0.8=
2.7+6.3÷2.1=
3.5×4=
3.6÷0.6=
12.5÷2.5=
4×0.4-0.2=
1.5÷0.5=
6.3÷0.7=
0.19×0.1=
2.8×5÷1.4=
2c+3c=
1.5×0.6b=
4.5a×2=
2.1×0.6×a=
x-0.1x=
4.1y-0.9y=
5k×0.6k=
16n-4-5n=
2b×b=
6.9m+3m=
n-0.3n=
9x÷3×0.2=
0.3+1.8=
2.1
5.9÷100=
0.059
1-0.08=
0.92
800×0.1÷20=
4
4.7-2.9=
1.8
3.05×30=
91.5
1.4×0.5b=
0.7b
9.6÷0.3÷10=
3.2
1.3×20=
26
6.5÷13=
0.5
0.64÷0.8=
0.8
2.7+6.3÷2.1=
5.7
3.5×4=
14
3.6÷0.6=
6
12.5÷2.5=
5
4×0.4-0.2=
1.4
1.5÷0.5=
3
6.3÷0.7=
9
0.19×0.1=
0.019
2.8×5÷1.4=
10
2c+3c=
5c
1.5×0.6b=
0.9b
4.5a×2=
9a
2.1×0.6×a=
1.26a
x-0.1x=
0.9x
4.1y-0.9y=
3.2y
5k×0.6k=
3k²
16n-4-5n=
11n-4
2b×b=
2b²
6.9m+3m=
9.9m
n-0.3n=
0.7n
9x÷3×0.2=
0.6x
答案
2.1 0.059 0.92 4 1.8 91.5 0.7b 3.2 26 0.5 0.8 5.7 14 6 5 1.4 3 9 0.019 10 5c 0.9b 9a 1.26a 0.9x 3.2y 3k² 11n-4 2b² 9.9m 0.7n 0.6x
解析
2.1；0.059；0.92；4；1.8；91.5；0.7b；3.2；26；0.5；0.8；5.7；14；6；5；1.4；3；9；0.019；10；5c；0.9b；9a；1.26a；0.9x；3.2y；3k²；11n - 4；2b²；9.9m；0.7n；0.6x
2. 用竖式计算。
3.9-0.952=
2.71+9.29=
27.1÷0.49≈
(得数保留两位小数)
3.7×13.5=
93.84÷9.2=
0.37×4.6≈
(得数保留一位小数)
3.9-0.952=
2.948
2.71+9.29=
12
27.1÷0.49≈
55.31
(得数保留两位小数)
3.7×13.5=
49.95
93.84÷9.2=
10.2
0.37×4.6≈
1.7
(得数保留一位小数)
答案
2.948 12 55.31 49.95 10.2 1.7 竖式略
解析
```
3.900
0.952
------
2.948
2.71
+ 9.29
------
12.00
55.306
0.49)2710.000
245
---
260
245
---
150
147
---
300
294
---
6
3.7
×13.5
-----
185
111
37
-----
49.95
10.2
9.2)93.84
92
---
184
184
---
0
0.37
× 4.6
-----
222
148
-----
1.702≈1.7
```
2.948
12
55.31
49.95
10.2
1.7
3.900
0.952
------
2.948
2.71
+ 9.29
------
12.00
55.306
0.49)2710.000
245
---
260
245
---
150
147
---
300
294
---
6
3.7
×13.5
-----
185
111
37
-----
49.95
10.2
9.2)93.84
92
---
184
184
---
0
0.37
× 4.6
-----
222
148
-----
1.702≈1.7
```
2.948
12
55.31
49.95
10.2
1.7
豆豆用蓝、白两种方块照下图这样拼图。
第10个图形中蓝方块有(
第10个图形中蓝方块有(
22
)个；第n个图形中蓝方块有(2n+2
)个；第(15
)个图形中有47个白方块。答案
22 2n+2 15
解析
22；$2n+2$；15
