直接写出得数1.2-38-62.5%2.9×13+0.12×2.9-2.991×(213-17)89×34÷89×3457÷58×591.25×3.2×2.5.-数学

题目简介

直接写出得数1.2-38-62.5%2.9×13+0.12×2.9-2.991×(213-17)89×34÷89×3457÷58×591.25×3.2×2.5.-数学

题目详情

直接写出得数
1.2-
3
8
-62.5%
2.9×
1
3
+0.12×2.9-2.9
91×(
2
13
-
1
7
8
9
×
3
4
÷
8
9
×
3
4
57÷58×591.25×3.2×2.5.
题型:解答题难度:中档来源:不详

答案

(1)1.2-class="stub"3
8
-62.5%,
=1.2-(class="stub"3
8
+class="stub"5
8
),
=1.2-1,
=0.2;

(2)2.9×class="stub"1
3
+0.12×2.9-2.9,
=2.9×(class="stub"1
3
+class="stub"3
25
-1),
=2.9×(class="stub"34
75
-1),
=2.9×(-class="stub"41
75
),
=-class="stub"1189
750


(3)91×(class="stub"2
13
-class="stub"1
7
),
=91×class="stub"2
13
-91×class="stub"1
7

=14-13,
=1;

(4)class="stub"8
9
×class="stub"3
4
÷class="stub"8
9
×class="stub"3
4

=class="stub"8
9
×class="stub"3
4
×class="stub"9
8
×class="stub"3
4

=(class="stub"8
9
×class="stub"9
8
)×(class="stub"3
4
×class="stub"3
4
),
=1×class="stub"9
16

=class="stub"9
16


(5)57÷58×59,
=class="stub"57
58
×(58+1),
=class="stub"57
58
×58+class="stub"57
58
×1,
=57+class="stub"57
58

=57class="stub"57
58


(6)1.25×3.2×2.5,
=1.25×8×0.4×2.5,
=(1.25×8)×(0.4×2.5),
=10×1,
=10.

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