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脱式计算(能简算的要简算)①31315-21314+5215-1114②14.85-1.58×8+31.2÷1.2③(113+212)÷(2-112)④2.25×35+2.75÷123+60%⑤9.81×0.1+0.5×98.1+0.049×981⑥1000+999-998-997+996+995-994-993+…+104+103-102-101.
题目详情
脱式计算(能简算的要简算)
①3
-2
+5
-1
②14.85-1.58×8+31.2÷1.2
③(1
+2
)÷(2-1
)
④2.25×
+2.75÷1
+60%
⑤9.81×0.1+0.5×98.1+0.049×981
⑥1000+999-998-997+996+995-994-993+…+104+103-102-101.
①3
13 |
15 |
13 |
14 |
2 |
15 |
1 |
14 |
②14.85-1.58×8+31.2÷1.2
③(1
1 |
3 |
1 |
2 |
1 |
2 |
④2.25×
3 |
5 |
2 |
3 |
⑤9.81×0.1+0.5×98.1+0.049×981
⑥1000+999-998-997+996+995-994-993+…+104+103-102-101.
▼优质解答
答案和解析
①3
-2
+5
-1
,
=(3
+5
)-(2
+1
),
=9-4,
=5;
②14.85-1.58×8+31.2÷1.2,
=14.85-12.64+26,
=2.21+26,
=28.21;
③(1
+2
)÷(2-1
),
=
÷
,
=7
;
④2.25×
+2.75÷1
+60%,
=2.25×
+2.75×
+
,
=(2.25+2.75+1)×
,
=6×
,
=3
;
⑤9.81×0.1+0.5×98.1+0.049×981,
=9.81×0.1+5×9.81+4.9×9.81,
=9.81×(0.1+5+4.9),
=9.81×10,
=98.1;
⑥1000+999-998-997+996+995-994-993+…+104+103-102-101,
=(1000+999-998-997)+(996+995-994-993)+…+(104+103-102-101),
=4×225,
=900.
13 |
15 |
13 |
14 |
2 |
15 |
1 |
14 |
=(3
13 |
15 |
2 |
15 |
13 |
14 |
1 |
14 |
=9-4,
=5;
②14.85-1.58×8+31.2÷1.2,
=14.85-12.64+26,
=2.21+26,
=28.21;
③(1
1 |
3 |
1 |
2 |
1 |
2 |
=
23 |
6 |
1 |
2 |
=7
1 |
2 |
④2.25×
3 |
5 |
2 |
3 |
=2.25×
3 |
5 |
3 |
5 |
3 |
5 |
=(2.25+2.75+1)×
3 |
5 |
=6×
3 |
5 |
=3
3 |
5 |
⑤9.81×0.1+0.5×98.1+0.049×981,
=9.81×0.1+5×9.81+4.9×9.81,
=9.81×(0.1+5+4.9),
=9.81×10,
=98.1;
⑥1000+999-998-997+996+995-994-993+…+104+103-102-101,
=(1000+999-998-997)+(996+995-994-993)+…+(104+103-102-101),
=4×225,
=900.
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