题目内容
计算下面各题.能简便的用简便方法计算
4.05÷0.5+10.75
21.6÷0.8-1.2×5
6.8×2.7+2.7×3.2
8.4×6.9÷(6.44-4.14)
0.38×102
4.8×0.27+0.52×2.7.
4.05÷0.5+10.75
21.6÷0.8-1.2×5
6.8×2.7+2.7×3.2
8.4×6.9÷(6.44-4.14)
0.38×102
4.8×0.27+0.52×2.7.
分析:①、②按照四则混合运算的运算顺序和计算法则进行计算;
③、⑤、⑥可以运用乘法分配律进行简算;
④运用乘法结合律进行简算.
③、⑤、⑥可以运用乘法分配律进行简算;
④运用乘法结合律进行简算.
解答:解:①4.05÷0.5+10.75,
=8.1+10.75,
=18.85;
②21.6÷0.8-1.2×5,
=27-6,
=21;
③6.8×2.7+2.7×3.2,
=(6.8+3.2)×2.7,
=10×2.7,
=27;
④8.4×6.9÷(6.44-4.14),
=8.4×6.9÷2.3,
=8.4×(6.9÷2.3),
=8.4×3,
=25.2;
⑤0.38×102,
=0.38×(100+2),
=0.38×100+0.38×2,
=38+0.76,
=38.76;
⑥4.8×0.27+0.52×2.7,
=0.48×2.7+0.52×2.7,
=(0.48+0.52)×2.7,
=1×2.7,
=2.7.
=8.1+10.75,
=18.85;
②21.6÷0.8-1.2×5,
=27-6,
=21;
③6.8×2.7+2.7×3.2,
=(6.8+3.2)×2.7,
=10×2.7,
=27;
④8.4×6.9÷(6.44-4.14),
=8.4×6.9÷2.3,
=8.4×(6.9÷2.3),
=8.4×3,
=25.2;
⑤0.38×102,
=0.38×(100+2),
=0.38×100+0.38×2,
=38+0.76,
=38.76;
⑥4.8×0.27+0.52×2.7,
=0.48×2.7+0.52×2.7,
=(0.48+0.52)×2.7,
=1×2.7,
=2.7.
点评:此题考查小数四则混合运算,计算要细心,同时注意运用恰当的方法进行简算.
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