Question

7．能簡算的要簡算．

0.46×8.3+11.7×0.46	0.67×101	0.125×2.5×32
7.2÷0.9+2.1	3.76÷0.4÷2.5	63.2×99+63.2

Answer 1

分析 ①②⑥運用乘法分配律計算即可．
③運用乘法交換律和結(jié)合律．
④先算除法再算加法．
⑤運用連除的性質(zhì)計算即可．

解答 解：①0.46×8.3+11.7×0.46
=0.46×（8.3+11.7）
=0.46×20
=9.2

②0.67×101
=0.67×（100+1）
=0.67×100+0.67×1
=67+0.67
=67.67

③0.125×2.5×32
=0.125×2.5×（4×8）
=0.125×8×（2.5×4）
=1×10
=10

④7.2÷0.9+2.1
=8+2.1
=10.1

⑤3.76÷0.4÷2.5
=3.76÷（0.4×2.5）
=3.76÷1
=3.76

⑥63.2×99+63.2
=63.2×（99+1）
=63.2×100
=6320

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(xué)的運算定律簡便計算．