题目内容
脱式计算
①(8-2
+2
)÷4
×6
;
②0.0125×3
+
×87.5÷
×
-14÷6×6;
③4
÷0.125×8;
④2006×2008×(
+
)
①(8-2
1 |
2 |
3 |
4 |
19 |
20 |
3 |
4 |
②0.0125×3
1 |
5 |
1 |
7 |
15 |
16 |
16 |
15 |
③4
7 |
16 |
④2006×2008×(
1 |
2006×2007 |
1 |
2007×2008 |
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:①把带分数化成假分数,先算括号内的,再算括号外的除法和乘法.
②把0.0125化成分数,87.5与
中的7约分,然后化成分数,按四则混合运算的顺序计算即可.
③把小数化为分数再计算.
④运用乘法分配律简算.
②把0.0125化成分数,87.5与
1 |
7 |
③把小数化为分数再计算.
④运用乘法分配律简算.
解答:
解:①(8-2
+2
)÷4
×6
=
÷
×
=
×
×
=
②0.0125×3
+
×87.5÷
×
-14÷6×6
=
×
+12.5×
×
-14
=
+
×
×
-14
=
+
-14
=
+
-
=
③4
÷0.125×8
=
÷
×8
=
×8×8
=284
④2006×2008×(
+
)
=2006×2008×
+
×2006×2008
=
+
=2
1 |
2 |
3 |
4 |
19 |
20 |
3 |
4 |
=
33 |
4 |
99 |
20 |
27 |
4 |
=
33 |
4 |
20 |
99 |
27 |
4 |
=
45 |
4 |
②0.0125×3
1 |
5 |
1 |
7 |
15 |
16 |
16 |
15 |
=
1 |
80 |
16 |
5 |
16 |
15 |
16 |
15 |
=
1 |
25 |
25 |
2 |
16 |
15 |
16 |
15 |
=
1 |
25 |
128 |
9 |
=
9 |
225 |
3200 |
225 |
3150 |
225 |
=
59 |
225 |
③4
7 |
16 |
=
71 |
16 |
1 |
8 |
=
71 |
16 |
=284
④2006×2008×(
1 |
2006×2007 |
1 |
2007×2008 |
=2006×2008×
1 |
2006×2007 |
1 |
2007×2008 |
=
2008 |
2007 |
2006 |
2007 |
=2
点评:考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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