脱式计算,能简算的要简算.①1315÷(14+25)②3÷34-34÷3③125×(56+34)+15④98%×981+0.02×981.-数学

题目简介

脱式计算,能简算的要简算.①1315÷(14+25)②3÷34-34÷3③125×(56+34)+15④98%×981+0.02×981.-数学

题目详情

脱式计算,能简算的要简算.
13
15
÷(
1
4
+
2
5
)

3
4
-
3
4
÷3

12
5
×(
5
6
+
3
4
)+
1
5

④98%×981+0.02×981.
题型:解答题难度:中档来源:不详

答案


class="stub"13
15
÷(class="stub"1
4
+class="stub"2
5
)

=class="stub"13
15
÷class="stub"13
20

=class="stub"4
3


3÷class="stub"3
4
-class="stub"3
4
÷3

=4-class="stub"1
4

=3class="stub"3
4


class="stub"12
5
×(class="stub"5
6
+class="stub"3
4
)+class="stub"1
5

=class="stub"12
5
×class="stub"5
6
+class="stub"12
5
×class="stub"3
4
+class="stub"1
5

=2+class="stub"9
5
+class="stub"1
5

=2+(class="stub"9
5
+class="stub"1
5
),
=2+2,
=4;

④98%×981+0.02×981,
=(98%+0.02)×981,
=1×981,
=981.

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