能简算的要简算①7.6×0.45+6.5×0.76-735×0.1②217×215+217③19941995×1995④45×37÷45×37⑤12+16+112+120+130.-数学

题目简介

能简算的要简算①7.6×0.45+6.5×0.76-735×0.1②217×215+217③19941995×1995④45×37÷45×37⑤12+16+112+120+130.-数学

题目详情

能简算的要简算
①7.6×0.45+6.5×0.76-7
3
5
×0.1
2
17
×
2
15
+
2
17

1994
1995
×1995
4
5
×
3
7
÷
4
5
×
3
7

1
2
+
1
6
+
1
12
+
1
20
+
1
30
题型:解答题难度:中档来源:不详

答案

①7.6×0.45+6.5×0.76-7class="stub"3
5
×0.1,
=7.6×0.45+0.65×7.6-7.6×0.1,
=7.6×(0.45+0.65-0.1),
=7.6×1,
=7.6;

class="stub"2
17
×class="stub"2
15
+class="stub"2
17

=class="stub"2
17
×(class="stub"2
15
+1),
=class="stub"2
17
×class="stub"17
15

=class="stub"2
15


class="stub"1994
1995
×1995=1994;

class="stub"4
5
×class="stub"3
7
÷class="stub"4
5
×class="stub"3
7

=(class="stub"4
5
×class="stub"5
4
)×(class="stub"3
7
×class="stub"3
7
),
=1×class="stub"9
49

=class="stub"9
49


class="stub"1
2
+class="stub"1
6
+class="stub"1
12
+class="stub"1
20
+class="stub"1
30

=(1-class="stub"1
2
)+(class="stub"1
2
-class="stub"1
3
)+(class="stub"1
3
-class="stub"1
4
)+(class="stub"1
4
-class="stub"1
5
)+(class="stub"1
5
-class="stub"1
6
),
=1-class="stub"1
2
+class="stub"1
2
-class="stub"1
3
+class="stub"1
3
-class="stub"1
4
+class="stub"1
4
-class="stub"1
5
+class="stub"1
5
-class="stub"1
6

=1-class="stub"1
6

=class="stub"5
6

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