计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82④78-517+98-1217⑤29-716

题目简介

计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82④78-517+98-1217⑤29-716

题目详情

计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.
①16×18-120÷15②3.2×2.77+0.23×3.2③7.6-2.05÷0.82
7
8
-
5
17
+
9
8
-
12
17
2
9
-
7
16
×
2
9
⑥13÷(
1
4
+
5
6
)×
3
4
题型:解答题难度:中档来源:不详

答案


①16×18-120÷15,
=288-8,
=280;

②3.2×2.77+0.23×3.2,
=3.2×(2.77+0.23),
=3.2×3,
=9.6;

③7.6-2.05÷0.82,
=7.6-2.5,
=5.1;

class="stub"7
8
-class="stub"5
17
+class="stub"9
8
-class="stub"12
17

=(class="stub"7
8
+class="stub"9
8
)-(class="stub"5
17
+class="stub"12
17
),
=2-1,
=1;

class="stub"2
9
-class="stub"7
16
×class="stub"2
9

=class="stub"2
9
×(1-class="stub"7
16
),
=class="stub"2
9
×class="stub"9
16

=class="stub"1
8


⑥13÷(class="stub"1
4
+class="stub"5
6
)×class="stub"3
4

=13÷class="stub"13
12
×class="stub"3
4

=12×class="stub"3
4

=9.

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