题目内容
(2011?灵宝市模拟)脱式计算(能简算的要简算).
①0.125×0.25×8×4
②6.6×12+8×6.6
③
×
+
÷
④8.05-0.75-
.
①0.125×0.25×8×4
②6.6×12+8×6.6
③
11 |
9 |
3 |
5 |
11 |
9 |
2 |
5 |
④8.05-0.75-
1 |
4 |
分析:①可根据乘法交换律及结合律进行计算;
②、③可根据乘法分配律进行计算;
④可根据一个数减两个数等于减去这两个数的和的减法性质进行计算.
②、③可根据乘法分配律进行计算;
④可根据一个数减两个数等于减去这两个数的和的减法性质进行计算.
解答:解:①0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
②6.6×12+8×6.6,
=(12+8)×6.6,
=20×6.6,
=132;
③
×
+
÷
=
×
+
×
,
=(
+
)×
,
=(
+
)×
,
=
×
,
=
;
④8.05-0.75-
=8.05-(0.75+0.25),
=8.05-1,
=7.05.
=(0.125×8)×(0.25×4),
=1×1,
=1;
②6.6×12+8×6.6,
=(12+8)×6.6,
=20×6.6,
=132;
③
11 |
9 |
3 |
5 |
11 |
9 |
2 |
5 |
=
11 |
9 |
3 |
5 |
11 |
9 |
5 |
2 |
=(
3 |
5 |
5 |
2 |
11 |
9 |
=(
6 |
10 |
25 |
10 |
11 |
9 |
=
31 |
10 |
11 |
9 |
=
341 |
90 |
④8.05-0.75-
1 |
4 |
=8.05-(0.75+0.25),
=8.05-1,
=7.05.
点评:本题考查了学生运用运算定律完成四则混合运算题目的能力.
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