怎样简便就怎样算:25×421×106.8×15+15×3.2(23+34-12)×12;46×4445.-数学

题目简介

怎样简便就怎样算:25×421×106.8×15+15×3.2(23+34-12)×12;46×4445.-数学

题目详情

怎样简便就怎样算:
2
5
×
4
21
×10
6.8×
1
5
+
1
5
×3.2
2
3
+
3
4
-
1
2
)×12;
46×
44
45
题型:解答题难度:中档来源:不详

答案

(1)class="stub"2
5
×class="stub"4
21
×10,
=(class="stub"2
5
×10)×class="stub"4
21

=4×class="stub"4
21

=class="stub"16
21


(2)6.8×class="stub"1
5
+class="stub"1
5
×3.2,
=(6.8+3.2)×class="stub"1
5

=10×class="stub"1
5

=2;

(3)(class="stub"2
3
+class="stub"3
4
-class="stub"1
2
)×12,
=class="stub"2
3
×12+class="stub"3
4
×12-class="stub"1
2
×12,
=8+9-6,
=11;

(4)46×class="stub"44
45

=(45+1)×class="stub"44
45

=45×class="stub"44
45
+class="stub"44
45

=44+class="stub"44
45

=44class="stub"44
45

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