脱式计算.①231-152÷49②13÷[(23+15)×113]③5+0.45÷0.9-1.75④1110÷(56×(37-38))-数学

题目简介

脱式计算.①231-152÷49②13÷[(23+15)×113]③5+0.45÷0.9-1.75④1110÷(56×(37-38))-数学

题目详情

脱式计算.
①231-152÷49
1
3
÷[(
2
3
+
1
5
)×
1
13
]
③5+0.45÷0.9-1.75
④1110÷(56×(
3
7
-
3
8
))
题型:解答题难度:中档来源:不详

答案

①231-152÷49
=231-3class="stub"5
49

=227class="stub"44
49


class="stub"1
3
÷[(class="stub"2
3
+class="stub"1
5
)×class="stub"1
13
]
=class="stub"1
3
÷[class="stub"13
15
×class="stub"1
13
],
=class="stub"1
3
×15,
=5;

③5+0.45÷0.9-1.75
=5+0.5-1.75,
=3.75;

④1110÷[56×(class="stub"3
7
-class="stub"3
8
)]
=1110÷[56×class="stub"3
7
-56×class="stub"3
8
],
=1110÷[24-21],
=1110÷3,
=370.

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