脱式计算(能简算的要写出简算过程.)37-35+47+0.41689÷8(6.9-3.15)÷0.3×0.82.5×(1.9+1.9+1.9+1.9)-数学

题目简介

脱式计算(能简算的要写出简算过程.)37-35+47+0.41689÷8(6.9-3.15)÷0.3×0.82.5×(1.9+1.9+1.9+1.9)-数学

题目详情

脱式计算(能简算的要写出简算过程.)
3
7
-
3
5
+
4
7
+0.4
16
8
9
÷8
(6.9-3.15)÷0.3×0.8
2.5×(1.9+1.9+1.9+1.9)
题型:解答题难度:中档来源:不详

答案

(1)class="stub"3
7
-class="stub"3
5
+class="stub"4
7
+0.4
=class="stub"3
7
+class="stub"4
7
-class="stub"3
5
+class="stub"2
5

=1-class="stub"3
5
+class="stub"2
5

=class="stub"4
5


(2)16class="stub"8
9
÷8
=(16+class="stub"8
9
)×class="stub"1
8

=16×class="stub"1
8
+class="stub"8
9
×class="stub"1
8

=2+class="stub"1
9

=2class="stub"1
9


(3)(6.9-3.15)÷0.3×0.8
=3.75÷0.3×0.8,
=12.5×0.8,
=10;

(4)2.5×(1.9+1.9+1.9+1.9)
=2.5×(4×1.9),
=2.5×4×1.9,
=10×1.9,
=19.

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