求:人教版五年级下数学简便计算题???
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(a+b)+ c = a +(b+c)
1. 2.73 + 0.89 + 1.27 2. 4.37 + 0.28 + 1.63 + 5.72
a-b-c = a -(b+c)
1. 10 - 0.432 - 2.568 2. 9.3 - 5.26 - 2.74
2. 13.4-(3.4+5.2) 4. 14.9-(5.2+4.9)
3. 18.32 - 5.47 - 4.32 6. 17.29 - 5.28 - 6.29
(a × b)×c = a ×(b × c)
1. 25 × 6.8 × 0.04 2. 0.25 × 32 × 0.125
2. 6.4 × 1.25 × 12.5
c ×(a+b)= ca + cb
1. 0.45 × 201 2. 0.58 × 10.1 3. 50.2 × 99
2. 4.7 × 9.9 5. 3.28 × 5.7 + 6.72 × 5.7
3. 2.1 × 99 + 2.1 7. 1.7 × 9.9 + 0.17
4. 23 × 0.1 + 2.3 × 9.9
a ÷ b ÷ c = a ÷ (b × c)
1. 6.3 ÷ 1.8 2. 4.2 ÷ 3.5 3. 9.5 ÷(1.9 × 8)
2. 12.8 ÷ (0.4 × 1.6) 5. 930 ÷ 0.6 ÷5
3. 63.4 ÷ 2.5 ÷ 0.4 7. (7.7 + 1.54)÷ 0.7
4. (11.7 + 9.9)÷ 0.9
1. 2.73 + 0.89 + 1.27 2. 4.37 + 0.28 + 1.63 + 5.72
a-b-c = a -(b+c)
1. 10 - 0.432 - 2.568 2. 9.3 - 5.26 - 2.74
2. 13.4-(3.4+5.2) 4. 14.9-(5.2+4.9)
3. 18.32 - 5.47 - 4.32 6. 17.29 - 5.28 - 6.29
(a × b)×c = a ×(b × c)
1. 25 × 6.8 × 0.04 2. 0.25 × 32 × 0.125
2. 6.4 × 1.25 × 12.5
c ×(a+b)= ca + cb
1. 0.45 × 201 2. 0.58 × 10.1 3. 50.2 × 99
2. 4.7 × 9.9 5. 3.28 × 5.7 + 6.72 × 5.7
3. 2.1 × 99 + 2.1 7. 1.7 × 9.9 + 0.17
4. 23 × 0.1 + 2.3 × 9.9
a ÷ b ÷ c = a ÷ (b × c)
1. 6.3 ÷ 1.8 2. 4.2 ÷ 3.5 3. 9.5 ÷(1.9 × 8)
2. 12.8 ÷ (0.4 × 1.6) 5. 930 ÷ 0.6 ÷5
3. 63.4 ÷ 2.5 ÷ 0.4 7. (7.7 + 1.54)÷ 0.7
4. (11.7 + 9.9)÷ 0.9
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