307×(715-320)-514=1334×58-234×58-58=(8512+347)-(47-712)=2.5×37×0.4×213=-数学

题目简介

307×(715-320)-514=1334×58-234×58-58=(8512+347)-(47-712)=2.5×37×0.4×213=-数学

题目详情

30
7
×(
7
15
-
3
20
)-
5
14
=
13
3
4
×
5
8
-2
3
4
×
5
8
-
5
8
=
(8
5
12
+3
4
7
)-(
4
7
-
7
12
)
=
2.5×
3
7
×0.4×2
1
3
=
题型:解答题难度:中档来源:不详

答案

class="stub"30
7
×(class="stub"7
15
-class="stub"3
20
)-class="stub"5
14

=class="stub"30
7
×class="stub"19
60
-class="stub"5
14

=class="stub"19
14
-class="stub"5
14

=1;

②13class="stub"3
4
×class="stub"5
8
-2class="stub"3
4
×class="stub"5
8
-class="stub"5
8

=class="stub"5
8
×(13class="stub"3
4
-2class="stub"3
4
-1),
=class="stub"5
8
×10,
=6class="stub"1
4


③(8class="stub"5
12
+3class="stub"4
7
)-(class="stub"4
7
-class="stub"7
12
),
=9+3,
=12;

④2.5×class="stub"3
7
×0.4×2class="stub"1
3

=class="stub"5
2
×class="stub"3
7
×class="stub"2
5
×class="stub"7
3

=1

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