下列各题怎么简算就怎么算.(1)99.14×16+0.86×1(2)125×0.59×0.8(3)73×0.25×27×4(4)4725-379-221(5)678×(2-13750)+318×135

题目简介

下列各题怎么简算就怎么算.(1)99.14×16+0.86×1(2)125×0.59×0.8(3)73×0.25×27×4(4)4725-379-221(5)678×(2-13750)+318×135

题目详情

下列各题怎么简算就怎么算.
(1)99.14×16+0.86×1
(2)125×0.59×0.8
(3)
7
3
×0.25×
2
7
×4

(4)4725-379-221
(5)6
7
8
×(2-1
37
50
)+3
1
8
×
13
50
题型:解答题难度:中档来源:不详

答案

(1)99.14×16+0.86×1,
=(100-0.86)×16+0.86×1,
=1600-0.86×16+0.86×1,
=1600-0.86×(16-1),
=1600-0.86×15,
=1600-12.9,
=1587.1;

(2)125×0.59×0.8,
=(125×0.8)×0.59,
=100×0.59,
=59;

(3)class="stub"7
3
×0.25×class="stub"2
7
×4

=class="stub"7
3
×class="stub"2
7
×(0.25×4),
=class="stub"2
3
×1,
=class="stub"2
3


(4)4725-379-221,
=4725-(379+221),
=4725-600,
=4125;

(5)6class="stub"7
8
×(2-1class="stub"37
50
)+3class="stub"1
8
×class="stub"13
50

=class="stub"55
8
×class="stub"13
50
+class="stub"25
8
×class="stub"13
50

=(class="stub"55
8
+class="stub"25
8
)×class="stub"13
50

=10×class="stub"13
50

=class="stub"13
5

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