题目内容
| 0.36+0.4= | 4.8×
|
1.5÷0.1= | 10×
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(
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分析:①注意小数点对齐;②④⑧注意约分;③把被除数和除数同时扩大10倍;⑤把分子相乘的积做分子,分母相乘的积做分母;⑥通分计算;⑦除以一个数等于乘这个数的倒数;⑨先算括号内的,再算括号外的;⑩把除法改为乘法,运用乘法分配律简算.
解答:解:0.36+0.4=0.76; 4.8×
=1.8; 1.5÷0.1=15; 10×
=8;
×
=
;
-
=
;
÷
=5;
×21×
=4.2;
(
+
)×
=
;
÷3+
×
=
.
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| 15 |
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| 8 |
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| 20 |
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(
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点评:此题考查了小数点的位置、约分、通分、分数乘法、分数除法、运算顺序、运算定律等知识.
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