题目内容
计算(能简算的要简算)
①7.6×5.2+7.6×4.8+3.6
②0.59×
+0.21×25%+0.2×0.25
③
+
+
+
×3
④85÷4+26×
+0.5
⑤
+0.25÷(
-1.5×
)
①7.6×5.2+7.6×4.8+3.6
②0.59×
| 1 |
| 4 |
③
| 49 |
| 5 |
| 499 |
| 5 |
| 4999 |
| 5 |
| 1 |
| 5 |
④85÷4+26×
| 1 |
| 4 |
⑤
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:①②④运用乘法的分配律进行计算.
③运用加法的结合律、交换律进行计算即可.
⑤先计算括号里面的,再计算括号外面的除法及加法.
③运用加法的结合律、交换律进行计算即可.
⑤先计算括号里面的,再计算括号外面的除法及加法.
解答:
解:①7.6×5.2+7.6×4.8+3.6
=7.6×(5.2+4.8)+3.6
=76+3.6
=79.6
②0.59×
+0.21×25%+0.2×0.25
=0.59×0.25+0.21×0.25+0.2×0.25
=0.25×(0.59+0.21+0.2)
=0.25×1
=0.25
③
+
+
+
×3
=
+
+
+
+
+
=(
+
)+(
+
)+(
+
)
=10+100+1000
=1110
④85÷4+26×
+0.5
=85×
+26×
+2×
=(85+26+2)×
=113×
=28.25
⑤
+0.25÷(
-1.5×
)
=
+
÷(
-
×
)
=
+
÷
=
=2
=7.6×(5.2+4.8)+3.6
=76+3.6
=79.6
②0.59×
| 1 |
| 4 |
=0.59×0.25+0.21×0.25+0.2×0.25
=0.25×(0.59+0.21+0.2)
=0.25×1
=0.25
③
| 49 |
| 5 |
| 499 |
| 5 |
| 4999 |
| 5 |
| 1 |
| 5 |
=
| 49 |
| 5 |
| 499 |
| 5 |
| 4999 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
=(
| 49 |
| 5 |
| 1 |
| 5 |
| 499 |
| 5 |
| 1 |
| 5 |
| 4999 |
| 5 |
| 1 |
| 5 |
=10+100+1000
=1110
④85÷4+26×
| 1 |
| 4 |
=85×
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
=(85+26+2)×
| 1 |
| 4 |
=113×
| 1 |
| 4 |
=28.25
⑤
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 3 |
| 2 |
| 1 |
| 3 |
=
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 9 |
| 4 |
=2
| 1 |
| 4 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算
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