计算,能简算的写出简算过程.(1)7.5÷25-2.5×52(2)3.5×45+5.5×80%+0.8(3)24×[(116-23)÷3](4)3.25-2.8×57+14×47÷0.1.-数学

题目简介

计算,能简算的写出简算过程.(1)7.5÷25-2.5×52(2)3.5×45+5.5×80%+0.8(3)24×[(116-23)÷3](4)3.25-2.8×57+14×47÷0.1.-数学

题目详情

计算,能简算的写出简算过程.
(1)7.5÷
2
5
-2.5×
5
2

(2)3.5×
4
5
+5.5×80%+0.8
(3)24×[(1
1
6
-
2
3
)÷3]
(4)3.25-2.8×
5
7
+
1
4
×
4
7
÷0.1.
题型:解答题难度:中档来源:不详

答案


(1)7.5÷class="stub"2
5
-2.5×class="stub"5
2

=7.5×class="stub"5
2
-2.5×class="stub"5
2

=(7.5-2.5)×class="stub"5
2

=5×class="stub"5
2

=class="stub"25
2


(2)3.5×class="stub"4
5
+5.5×80%+0.8,
=3.5×0.8+5.5×0.8+0.8,
=(3.5+5.5+1)×0.8,
=10×0.8,
=8;

(3)24×[(1class="stub"1
6
-class="stub"2
3
)÷3],
=24×[class="stub"1
2
÷3],
=24×class="stub"1
6

=4;

(4)3.25-2.8×class="stub"5
7
+class="stub"1
4
×class="stub"4
7
÷0.1,
=3.25-2+class="stub"1
7
÷0.1,
=3.25-2+class="stub"10
7

=1.25+class="stub"10
7

=2class="stub"19
28

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