用简便方法计算,并写出简算过程.246+78.5+254+21.50.125×2.5×32036×(23-14+19)724×0.2+1724÷5.-数学

题目简介

用简便方法计算,并写出简算过程.246+78.5+254+21.50.125×2.5×32036×(23-14+19)724×0.2+1724÷5.-数学

题目详情

用简便方法计算,并写出简算过程.
246+78.5+254+21.5
0.125×2.5×320
36×(
2
3
-
1
4
+
1
9
7
24
×0.2+
17
24
÷5.
题型:解答题难度:中档来源:不详

答案

(1)246+78.5+254+21.5
=(246+254)+(78.5+21.5),
=500+100,
=600;

(2)0.125×2.5×320
=0.125×2.5×80×4,
=(0.125×80)×(2.5×4),
=10×10,
=100;

(3)36×(class="stub"2
3
-class="stub"1
4
+class="stub"1
9

=36×class="stub"2
3
-36×class="stub"1
4
+36×class="stub"1
9

=24-9+4,
=19;

(4)class="stub"7
24
×0.2+class="stub"17
24
÷5
=class="stub"7
24
××class="stub"1
5
+class="stub"17
24
×class="stub"1
5

=(class="stub"7
24
+class="stub"17
24
)×class="stub"1
5

=1×class="stub"1
5

=class="stub"1
5

更多内容推荐