怎样简便就怎样算7.8×101514÷59×64-159×[34-(716-14)]34×0.53+75%×1.4725×3.2×1.2530514÷1514.-数学

题目简介

怎样简便就怎样算7.8×101514÷59×64-159×[34-(716-14)]34×0.53+75%×1.4725×3.2×1.2530514÷1514.-数学

题目详情

怎样简便就怎样算
7.8×101
5
14
÷
5
9
×64-1
5
9
×[
3
4
-(
7
16
-
1
4
)]
3
4
×0.53+75%×1.47
25×3.2×1.2530
5
14
÷
15
14
题型:解答题难度:中档来源:不详

答案


(1)7.8×101,
=7.8×(100+1),
=7.8×100+7.8×1,
=780+7.8,
=787.8;

(2)class="stub"5
14
÷class="stub"5
9
×64-1,
=class="stub"9
14
×64-1,
=41class="stub"1
7
-1,
=40class="stub"1
7


(3)class="stub"5
9
×[class="stub"3
4
-(class="stub"7
16
-class="stub"1
4
)],
=class="stub"5
9
×[class="stub"3
4
-class="stub"7
16
+class="stub"1
4
],
=class="stub"5
9
×[1-class="stub"7
16
],
=class="stub"5
9
×class="stub"9
16

=class="stub"5
16


(4)class="stub"3
4
×0.53+75%×1.47,
=0.75×0.53+0.75×1.47,
=0.75×(0.53+1.47),
=0.75×2,
=1.5;

(5)25×3.2×1.25,
=25×(4×0.8)×1.25,
=(25×4)×(0.8×1.25),
=100×1,
=100;

(6)30class="stub"5
14
÷class="stub"15
14

=(30+class="stub"5
14
)×class="stub"14
15

=30×class="stub"14
15
+class="stub"5
14
×class="stub"14
15

=28+class="stub"1
3

=28class="stub"1
3

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