脱式计算(能简算的要简算)14.85-1.58×8+31.2÷1.2 9.81×0.1+0.5×98.1+0...
脱式计算(能简算的要简算)14.85-1.58×8+31.2÷1.29.81×0.1+0.5×98.1+0.049×9811000+999-998-997+996+995...
脱式计算(能简算的要简算)14.85-1.58×8+31.2÷1.2 9.81×0.1+0.5×98.1+0.049×9811000+999-998-997+996+995-994-993+…+104+103-102-101.
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(1)14.85-1.58×8+31.2÷1.2,
=14.85-12.64+26,
=28.21;
(2)9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5×9.81+4.9×9.81,
=(0.1+5+4.9)×9.81,
=10×9.81,
=98.1;
(3)1000+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.
=14.85-12.64+26,
=28.21;
(2)9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5×9.81+4.9×9.81,
=(0.1+5+4.9)×9.81,
=10×9.81,
=98.1;
(3)1000+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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