简便计算①504-(304-167)②20.8×7-0.8×7③1930-37+1130.-数学

题目简介

简便计算①504-(304-167)②20.8×7-0.8×7③1930-37+1130.-数学

题目详情

简便计算
①504-(304-167)
②20.8×7-0.8×7
19
30
-
3
7
+
11
30
题型:解答题难度:中档来源:不详

答案

①504-(304-167)
=504-304+167,
=267;
②20.8×7-0.8×7
=(20.8-0.8)×7,
=20×7,
=140;
class="stub"19
30
-class="stub"3
7
+class="stub"11
30

=class="stub"19
30
+class="stub"11
30
-class="stub"3
7

=1-class="stub"3
7

=class="stub"4
7

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