(1)3318+312÷24×205(2)47.1×9.4-47.1÷2-+47.1(3)[(1-0.5)×20]÷[(1+0.25)÷4](4)12-13+14(5)100-99+98-97+96-

题目简介

(1)3318+312÷24×205(2)47.1×9.4-47.1÷2-+47.1(3)[(1-0.5)×20]÷[(1+0.25)÷4](4)12-13+14(5)100-99+98-97+96-

题目详情

(1)3318+312÷24×205
(2)47.1×9.4-47.1÷2-+47.1
(3)[(1-0.5)×20]÷[(1+0.25)÷4]
(4)
1
2
-
1
3
+
1
4

(5)100-99+98-97+96-…+4-3+2-1
(6)
1
5×6
+
1
6×7
+
1
7×8
+------+
1
49×50
题型:解答题难度:中档来源:不详

答案

(1)3318+312÷24×205,
=3318+13×205,
=3318+2665,
=5983;
(2)47.1×9.4-47.1÷2-47.1,
=47.1×(9.4-0.5-1),
=47.1×7.9,
=372.09;
(3)[(1-0.5)×20]÷[(1+0.25)÷4],
=10÷0.3125,
=32;
(4)class="stub"1
2
-class="stub"1
3
+class="stub"1
4

=(class="stub"1
2
+class="stub"1
4
-class="stub"1
3

=class="stub"3
4
-class="stub"1
3

=class="stub"5
12

(5)100-99+98-97+96-…+4-3+2-1,
=(100-99)+(98-97)+(96-95)+…+(4-3)+(2-1),
=1×50,
=50;
(6)class="stub"1
5×6
+class="stub"1
6×7
+class="stub"1
7×8
+…+class="stub"1
49×50

=(class="stub"1
5
-class="stub"1
6
)+(class="stub"1
6
-class="stub"1
7
)+(class="stub"1
7
-class="stub"1
8
)+…+(class="stub"1
49
-class="stub"1
50
)

=class="stub"1
5
-class="stub"1
50

=class="stub"9
50

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