题目内容
3×8×4×5=(3×4)×(8×5)运用了
- A.乘法交换律
- B.乘法结合律
- C.乘法分配律
- D.乘法交换律和结合律
D
分析:3×8×4×5,运用乘法交换律和结合律进行简算.
解答:3×8×4×5,
=(3×4)×(8×5),
=12×40,
=480.
故选:D.
点评:此题考查的目的是理解乘法交换律、乘法结合律的意义,并且能够灵活运用乘法交换律和结合律进行简便计算.
分析:3×8×4×5,运用乘法交换律和结合律进行简算.
解答:3×8×4×5,
=(3×4)×(8×5),
=12×40,
=480.
故选:D.
点评:此题考查的目的是理解乘法交换律、乘法结合律的意义,并且能够灵活运用乘法交换律和结合律进行简便计算.
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3÷3+3-3=1 33÷33=1(1)
① 3 3 3 3=1 |
② 3 3 3 3=2 |
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |
(2)
① 3 3 3 3=1 |
② 3 3 3 3=2 |
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |
① 3 3 3 3=1 |
② 3 3 3 3=2 |
③ 3 3 3 3=3 |
④ 3 3 3 3=4 |
⑤ 3 3 3 3=5 |
⑥ 3 3 3 3=6 |
⑦ 3 3 3 3=7 |
⑧ 3 3 3 3=8 |
⑨ 3 3 3 3=9 |
⑩ 3 3 3 3=10 |
180÷60= | 12×25= | 0÷90= |
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25×6×4= | 420÷35= | 36×5×4= |
120÷5÷3= | 198-75-25= | 120-20÷5= |
59亿-58亿= | (1.3+3.5)÷0.6= | 75÷2.5= |
0.45÷1.25÷8= | 2.5×7.6×4= | 97.6÷0.02= |
8.8-(0.25+0.4)= | 0.25+87+0.75= | 0.8-0.35×2= |
0.1÷0.01×0.1= | 9.9+9.9×99= | 2.7×3.6+6.4×2.7= |
720÷8÷9= | 2.9+5.7+2.1= | 2-0.16-0.64= |
16.7+84.5-16.7= | 6.8-(3.8+2.9)= | 9×1.3+9×6.7= |
5.5-5.25+5.2= | 0.8×25-10= | 42.8×25×4= |
7.2+2.8= | 0.9÷0.01= | 3.5+7.6= |
3×0.2×0.5= | 0.96÷0.3= | 1.5×0.4= |
7÷0.25= | 2.5×0.7×0.8= | 8-2.5= |
16÷1.6= | 5.6×1.01= | 8×(2.5+0.25)= |
0.36+0.64= | 64.32÷16= | 72.8÷0.8= |
8.4×0.2+1.6×0.2= | 8.4÷4.2= | 0.05×0.8= |
2.56-0.37= | 1.23×3= | 25×0.8×0.5= |
12×2.5= | 3.2÷1.6= | 3.5+3.5×3= |
19.6÷2= | 8.8÷2.2= | 3.9+2.03= |
7.2×0.3+2.8×0.3= | 13.8+9.9= | 2.4×2.5= |
0.75×4= | (1.5+0.25)×4= | 4.2÷0.1= |
4.2÷3.5= | 2.14-0.9= | 27+456+73= |
12÷0.3= | 2.87÷0.7= | 13÷4= |
24÷4+56÷4= | 2.1×0.3÷2.1= | 2.3-0÷8.1= |
1.37-1.37÷1.37= | 4.4÷(5×0.2)= | 7×1.3= |
0.96÷0.06= | 0.36×0.3= | 0.35÷0.7= |
13.65÷13= | 4×0.8×0.25×1.25= | 13+0.7÷0.7= |
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1.6×[(12-7.2)÷(0.84÷2.1)]= |