脱式计算(能简算的要简算)
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/10 13:16:00
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
第四题不用做,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
第四题不用做,简算!
3-2+5-1
=1+5-1
=5
14.85-1.58×8+31.2÷1.2
=14.85-12.64+26
=2.12+26
=28.12
(1+2)÷(2-1)
=3÷1
=3
9.81×0.1+98.1×0.5+0.049×981
=9.81×(0.1+5+4.9)
=9.81×10
=98.1
=1+5-1
=5
14.85-1.58×8+31.2÷1.2
=14.85-12.64+26
=2.12+26
=28.12
(1+2)÷(2-1)
=3÷1
=3
9.81×0.1+98.1×0.5+0.049×981
=9.81×(0.1+5+4.9)
=9.81×10
=98.1