用递等式计算:(浙教版学生最后2题必做,其他4题任选;人教版学生可以任选其中6题.)①987+104×65-1747;②86.4÷3.2-6.4×3.2;③3763÷7+17×2663;④17-16.

题目简介

用递等式计算:(浙教版学生最后2题必做,其他4题任选;人教版学生可以任选其中6题.)①987+104×65-1747;②86.4÷3.2-6.4×3.2;③3763÷7+17×2663;④17-16.

题目详情

用递等式计算:(浙教版学生最后2题必做,其他4题任选;人教版学生可以任选其中6题.)
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;
⑦6
3
13
÷
10
27
+5
2
13
×2.7-1
5
13
×2
7
10

⑧〔14.8-3
1
3
÷(7
5
12
-5.75)〕×0.4.
题型:解答题难度:中档来源:不详

答案

①987+104×65-1747,
=987+6760-1747,
=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"37
63
+class="stub"26
63
)×class="stub"1
7

=1×class="stub"1
7

=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,
=class="stub"7
9
×6.3+class="stub"4
21
×6.3-class="stub"3
7
×
6.3,
=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"10
14
-class="stub"7
14
)×class="stub"28
3
]-0.5,
=15÷[class="stub"3
14
×class="stub"28
3
]-0.5,
=15÷2-0.5,
=7.5-0.5,
=7;

⑦6class="stub"3
13
÷class="stub"10
27
+5class="stub"2
13
×2.7-1class="stub"5
13
×2class="stub"7
10

=6class="stub"3
13
×class="stub"27
10
+5class="stub"2
13
×class="stub"27
10
-1class="stub"5
13
×class="stub"27
10

=(6class="stub"3
13
+5class="stub"2
13
-1class="stub"5
13
)×class="stub"27
10

=10×class="stub"27
10

=27;

⑧〔14.8-3class="stub"1
3
÷(7class="stub"5
12
-5.75)〕×0.4,
=[14.8-class="stub"10
3
÷(class="stub"89
12
-class="stub"23
4
)]×0.4,
=[14.8-class="stub"10
3
÷(class="stub"89
12
-class="stub"69
12
)]×0.4,
=[14.8-class="stub"10
3
÷class="stub"5
3
]×0.4,
=[14.8-class="stub"10
3
×class="stub"3
5
]×0.4,
=[14.8-2]×0.4,
=12.8×0.4,
=5.12.

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