脱式计算(能简算的要简算)①31315?21314+5215?1114②14.85-1.58×8+31.2÷1.2③2.25×35+2.75÷123+60%
脱式计算(能简算的要简算)①31315?21314+5215?1114②14.85-1.58×8+31.2÷1.2③2.25×35+2.75÷123+60%④1000+9...
脱式计算(能简算的要简算)①31315?21314+5215?1114②14.85-1.58×8+31.2÷1.2③2.25×35+2.75÷123+60%④1000+999-998-997+996+995-994-993+…+104+103-102-101.
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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,
=28.21;
③2.25×
+2.75÷1
+60%,
=2.25×0.6+2.75×0.6+0.6,
=(2.25+2.75+1)×0.6,
=6×0.6,
=3.6;
④1000+999-998-997+996+995-994-993+…+104+103-102-101,
=(1000+999-998-997)+(996+995-994-993)+…+(104+103-102-101),
=4+4+…+4,
=4×(900÷4),
=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,
=28.21;
③2.25×
3 |
5 |
2 |
3 |
=2.25×0.6+2.75×0.6+0.6,
=(2.25+2.75+1)×0.6,
=6×0.6,
=3.6;
④1000+999-998-997+996+995-994-993+…+104+103-102-101,
=(1000+999-998-997)+(996+995-994-993)+…+(104+103-102-101),
=4+4+…+4,
=4×(900÷4),
=900.
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