49×3.25+959×314;4517-(1517+0.625);(25+12)×(4-223);3.12÷1.2-1.2×0.6;1998+7650÷75;(114+256)÷(114×0.8-0

题目简介

49×3.25+959×314;4517-(1517+0.625);(25+12)×(4-223);3.12÷1.2-1.2×0.6;1998+7650÷75;(114+256)÷(114×0.8-0

题目详情

4
9
×3.25+9
5
9
×3
1
4
4
5
17
-(1
5
17
+0.625);
2
5
+
1
2
)×(4-2
2
3
);
3.12÷1.2-1.2×0.6;
1998+7650÷75;(1
1
4
+2
5
6
)÷(1
1
4
×0.8-0.3).
题型:解答题难度:中档来源:不详

答案

(1)class="stub"4
9
×3.25+9class="stub"5
9
×3class="stub"1
4

=class="stub"4
9
×3.25+9class="stub"5
9
×3.25
=(class="stub"4
9
+9class="stub"5
9
)×3.25
=10×3.25
=32.5;

(2)4class="stub"5
17
-(1class="stub"5
17
+0.625)
=4class="stub"5
17
-1class="stub"5
17
-0.625
=(4class="stub"5
17
-1class="stub"5
17
)-0.625
=3-0.625
=2.375;

(3)(class="stub"2
5
+class="stub"1
2
)×(4-2class="stub"2
3

=class="stub"9
10
×class="stub"4
3

=class="stub"6
5


(4)3.12÷1.2-1.2×0.6
=2.6-0.72
=1.88;

(5)1998+7650÷75
=1998+102
=2100;

(6)(1class="stub"1
4
+2class="stub"5
6
)÷(1class="stub"1
4
×0.8-0.3)
=class="stub"49
12
÷(1-0.3)
=class="stub"49
12
÷0.7
=class="stub"49
12
÷class="stub"7
10

=class="stub"49
12
×class="stub"10
7

=class="stub"35
6

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