计算下面各题,能简算的要用简便方法计算.①250×8-245②10.15-6.25-3.75+7.85③78×59+59÷8④24+5÷(3-2.5)⑤1013×(34+1÷56)⑥2÷[4×(12-

题目简介

计算下面各题,能简算的要用简便方法计算.①250×8-245②10.15-6.25-3.75+7.85③78×59+59÷8④24+5÷(3-2.5)⑤1013×(34+1÷56)⑥2÷[4×(12-

题目详情

计算下面各题,能简算的要用简便方法计算.
①250×8-245
②10.15-6.25-3.75+7.85
7
8
×
5
9
+
5
9
÷8
④24+5÷(3-2.5)
10
13
×(
3
4
+1÷
5
6

⑥2÷[4×(
1
2
-
1
3
)].
题型:解答题难度:中档来源:不详

答案

①250×8-245,
=2000-245,
=1755;

②10.15-6.25-3.75+7.85,
=10.15+7.85-(6.25+3.75),
=18-10,
=8;

class="stub"7
8
×class="stub"5
9
+class="stub"5
9
÷8,
=class="stub"7
8
×class="stub"5
9
+class="stub"5
9
×class="stub"1
8

=(class="stub"1
8
+class="stub"7
8
)×class="stub"5
9

=1×class="stub"5
9

=class="stub"5
9


④24+5÷(3-2.5),
=24+5÷0.5,
=24+10,
=34;

class="stub"10
13
×(class="stub"3
4
+1÷class="stub"5
6
),
=class="stub"10
13
×(class="stub"3
4
+class="stub"6
5
),
=class="stub"10
13
×(class="stub"15
20
+class="stub"24
20
),
=class="stub"10
13
×class="stub"39
20

=class="stub"3
2


⑥2÷[4×(class="stub"1
2
-class="stub"1
3
)]
=2÷[4×(class="stub"3
6
-class="stub"2
6
)],
=2÷[4×class="stub"1
6
],
=2÷class="stub"2
3

=3.

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