脱式计算,能简算的要简算.14+27×14+57÷412.4-2.4×3.75÷2.52.5×25-0.21÷13+9.631999+999×999.-数学

题目简介

脱式计算,能简算的要简算.14+27×14+57÷412.4-2.4×3.75÷2.52.5×25-0.21÷13+9.631999+999×999.-数学

题目详情

脱式计算,能简算的要简算.
1
4
+
2
7
×
1
4
+
5
7
÷4
12.4-2.4×3.75÷2.5
2.5×
2
5
-0.21÷
1
3
+9.63
1999+999×999.
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
4
+class="stub"2
7
×class="stub"1
4
+class="stub"5
7
÷4,
=class="stub"1
4
+class="stub"2
7
×class="stub"1
4
+class="stub"5
7
×class="stub"1
4

=(1+class="stub"2
7
+class="stub"5
7
)×class="stub"1
4

=2×class="stub"1
4

=class="stub"1
2


(2)12.4-2.4×3.75÷2.5,
=12.4-9÷2.5,
=12.4-3.6,
=8.8;

(3)2.5×class="stub"2
5
-0.21÷class="stub"1
3
+9.63,
=1-0.63+9.63,
=1+(9.63-0.63),
=1+9,
=10;

(4)1999+999×999,
=1000+999+999×999,
=1000+999×(1+999),
=1000+999×1000,
=1000×(1+999),
=1000×1000,
=1000000.

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