①7.28+3.2÷2.5 | ②1.25×0.16×2.5 | ③4.25÷12.5÷0.8 |
④9.9×10.2 | ⑤6.5×(0.96+9.728÷3.2) | ⑥2.5×7.28+2.72×2.5. |
分析 ①先算除法,再算加法;
②根據(jù)乘法交換律和結合律進行簡算;
③根據(jù)除法的性質進行簡算;
④、⑥根據(jù)乘法分配律進行簡算;
⑤先算除法,再算加法,最后算乘法.
解答 解:①7.28+3.2÷2.5
=7.28+1.28
=8.56;
②1.25×0.16×2.5
=1.25×(8×0.02)×2.5
=(1.25×8)×(0.02×2.5)
=10×0.05
=0.5;
③4.25÷12.5÷0.8
=4.25÷(12.5×0.8)
=4.25÷10
=0.425;
④9.9×10.2
=(10-0.1)×10.2
=10×10.2-0.1×10.2
=102-1.02
=100.98;
⑤6.5×(0.96+9.728÷3.2)
=6.5×(0.96+3.04)
=6.5×4
=26;
⑥2.5×7.28+2.72×2.5
=2.5×(7.28+2.72)
=2.5×10
=25.
點評 考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算定律簡便計算.
科目:小學數(shù)學 來源: 題型:選擇題
A. | 擴大10倍 | B. | 不變 | C. | 縮小10倍 |
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