脱式计算(③④⑤小题用简便方法).①635+9030÷86×13②4.1-2.56÷(0.18+0.62)③45×101④5.7-(1.9-1.3)⑤9899+9899×98⑥45÷〔58×(16+1

题目简介

脱式计算(③④⑤小题用简便方法).①635+9030÷86×13②4.1-2.56÷(0.18+0.62)③45×101④5.7-(1.9-1.3)⑤9899+9899×98⑥45÷〔58×(16+1

题目详情

脱式计算(③④⑤小题用简便方法).
①635+9030÷86×13
②4.1-2.56÷(0.18+0.62)③45×101
④5.7-(1.9-1.3)
98
99
+
98
99
×98
4
5
÷〔
5
8
×(
1
6
+
1
3
)〕
题型:解答题难度:中档来源:不详

答案

①635+9030÷86×13,
=635+105×13,
=635+1365,
=2000;

②4.1-2.56÷(0.18+0.62),
=4.1-2.56÷0.8,
=4.1-3.2,
=0.9;

③45×101,
=45×(100+1),
=4500+45,
=4545;

④5.7-(1.9-1.3),
=5.7-1.9+1.3,
=5.7+1.3-1.9,
=7-1.9,
=5.1;

class="stub"98
99
+class="stub"98
99
×98,
=class="stub"98
99
×(1+98),
=class="stub"98
99
×99,
=98;

class="stub"4
5
÷〔class="stub"5
8
×(class="stub"1
6
+class="stub"1
3
)〕,
=class="stub"4
5
÷[class="stub"5
8
×(class="stub"1
6
+class="stub"2
6
)],
=class="stub"4
5
÷[class="stub"5
8
×class="stub"1
2
],
=class="stub"4
5
÷class="stub"5
16

=class="stub"4
5
×class="stub"16
5

=class="stub"64
25

=2class="stub"14
25

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