题目内容
用递等式计算,能简算的要简算.
3.5×98+3.5×2
7.05-4-1.05
×16-8÷
1÷[
×(
-
)].
3.5×98+3.5×2
7.05-4-1.05
8 |
17 |
17 |
8 |
1÷[
1 |
2 |
6 |
5 |
7 |
10 |
分析:(1)运用乘法分配律解答,
(2)运用减法性质解答,
(3)运用乘法分配律解答,
(4)依据四则运算计算方法解答.
(2)运用减法性质解答,
(3)运用乘法分配律解答,
(4)依据四则运算计算方法解答.
解答:解:(1)3.5×98+3.5×2,
=3.5×(98+2),
=3.5×100,
=350;
(2)7.05-4-1.05,
=7.05-(4+1.05),
=7.05-5.05,
=2;
(3)
×16-8÷
,
=
×(16-8),
=
×8,
=3
;
(4)1÷[
×(
-
)],
=1÷[
×
],
=1÷
,
=4.
=3.5×(98+2),
=3.5×100,
=350;
(2)7.05-4-1.05,
=7.05-(4+1.05),
=7.05-5.05,
=2;
(3)
8 |
17 |
17 |
8 |
=
8 |
17 |
=
8 |
17 |
=3
13 |
17 |
(4)1÷[
1 |
2 |
6 |
5 |
7 |
10 |
=1÷[
1 |
2 |
1 |
2 |
=1÷
1 |
4 |
=4.
点评:本题主要考查学生运用乘法分配律,进行简便计算的能力.
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