用递等式计算.①987+104×65-1747②86.4÷3.2-6.4×3.2③3763÷7+17×2663④17-16.8÷(1.8+7.2×112)⑤(79+421-37)×6.3⑥15÷〔(5

题目简介

用递等式计算.①987+104×65-1747②86.4÷3.2-6.4×3.2③3763÷7+17×2663④17-16.8÷(1.8+7.2×112)⑤(79+421-37)×6.3⑥15÷〔(5

题目详情

用递等式计算.
①987+104×65-1747
②86.4÷3.2-6.4×3.2
37
63
÷7+
1
7
×
26
63
④17-16.8÷(1.8+7.2×
1
12
⑤(
7
9
+
4
21
-
3
7
)×6.3
⑥15÷〔(
5
7
-
1
2
)÷
3
28
〕-0.5.
题型:解答题难度:中档来源:不详

答案

①987+104×65-1747,
=987+(100+4)×65-1747,
=987+6500+260-1747,
=7747-1747,
=6000;

②86.4÷3.2-6.4×3.2,
=27-20.48,
=6.52;

class="stub"37
63
÷7+class="stub"1
7
×class="stub"26
63

=class="stub"37
63
×class="stub"1
7
+class="stub"1
7
×class="stub"26
63

=class="stub"1
7
×(class="stub"37
63
+class="stub"26
63
),
=class="stub"1
7


④17-16.8÷(1.8+7.2×class="stub"1
12
),
=17-16.8÷(1.8+0.6),
=17-16.8÷2.4,
=17-7,
=10;

⑤(class="stub"7
9
+class="stub"4
21
-class="stub"3
7
)×6.3,
=6.3×class="stub"7
9
+6.3×class="stub"4
21
-6.3×class="stub"3
7

=4.9+1.2-2.7,
=3.4;

⑥15÷〔(class="stub"5
7
-class="stub"1
2
)÷class="stub"3
28
〕-0.5,
=15÷[(class="stub"5
7
-class="stub"1
2
)×class="stub"28
3
]-0.5,
=15÷[class="stub"5
7
×class="stub"28
3
-class="stub"1
2
×class="stub"28
3
]-0.5,
=15÷[class="stub"20
3
-class="stub"14
3
]-0.5,
=15÷2-0.5,
=7.5-0.5,
=7.

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