摘要:75 + 63 = 63 + □ 52 + □ = 88 + 52 a + b = □ + □
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, , 表示什么数?(1)0.38+ 0.62 0.62 =1 |
(2) 3.12 3.12 +9.23=12.35 |
| (3)5.66- 3.33 3.33 =2.33 |
(4) 4 4 -2.95=1.05 |
| (5)0.56+ 0.43 0.43 =0.99 |
(6)8.38- 5.75 5.75 =2.63. |
计算:
①5.75-8.63+(9.25-2.37)
②15.7-8
-2
③(44×4)×25
④999×363+7364
⑤9.8+99.8+999.8+9999.8+99999.8
⑥1-
+
+
+
⑦(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
)
⑧
×48.
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①5.75-8.63+(9.25-2.37)
②15.7-8
| 1 |
| 3 |
| 2 |
| 3 |
③(44×4)×25
④999×363+7364
⑤9.8+99.8+999.8+9999.8+99999.8
⑥1-
| 1 |
| 5 |
| 1 |
| 30 |
| 1 |
| 42 |
| 1 |
| 56 |
⑦(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
⑧
| 54 |
| 55 |
根据运算律填空.
3.6×0.75=0.75×
0.25×3.2=0.25×
7.6×10.1=7.6×
6.3×0.87+3.7×0.87=(
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3.6×0.75=0.75×
3.6
3.6
;0.25×3.2=0.25×
4
4
×0.8
0.8
;7.6×10.1=7.6×
10
10
+7.6×0.1
0.1
;6.3×0.87+3.7×0.87=(
6.3
6.3
+3.7
3.7
)×0.87.