下面各题,怎样简便就怎样算.89×11121516×45×2315×(23×35)417×(25×68)13×12×12×23459×3.-数学

题目简介

下面各题,怎样简便就怎样算.89×11121516×45×2315×(23×35)417×(25×68)13×12×12×23459×3.-数学

题目详情

下面各题,怎样简便就怎样算.
8
9
×
11
12
15
16
×
4
5
×
2
3
15×(
2
3
×
3
5
)
4
17
×(25×68)
1
3
×
1
2
×
1
2
×
2
3
4
5
9
×3
题型:解答题难度:中档来源:不详

答案

class="stub"8
9
×class="stub"11
12
=class="stub"22
27


class="stub"15
16
×class="stub"4
5
×class="stub"2
3
=class="stub"1
2


③15×(class="stub"2
3
×class="stub"3
5
),
=15×class="stub"2
5

=6;

class="stub"4
17
×(25×68),
=class="stub"4
17
×68×25,
=16×25,
=400;

class="stub"1
3
×class="stub"1
2
×class="stub"1
2
×class="stub"2
3
=class="stub"1
18


⑥4class="stub"5
9
×3,
=(4+class="stub"5
9
)×3,
=4×3+class="stub"5
9
×3,
=12+class="stub"5
3

=13class="stub"2
3

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