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简算1746+1747+1748.7.81×48+78.1×4.1+0.78×90.38×29+84×71+46×29.34÷17+29÷17+27÷17+46÷17.
题目详情
简算
1746+1747+1748. | 7.81×48+78.1×4.1+0.78×90. |
38×29+84×71+46×29. | 34÷17+29÷17+27÷17+46÷17. |
▼优质解答
答案和解析
(1)1746+1747+1748
=1750×3-(4+3+2)
=5250-9
=5241;
(2)7.81×48+78.1×4.1+0.78×90
=7.81×48+7.81×41+0.78×90
=(48+41)×7.81+0.78×90
=89×7.81+0.78×90
=(7.81+0.78)×90-7.81
=773.1-7.81
=765.29;
(3)38×29+84×71+46×29
=(38+46)×29+84×71
=84×29+84×71
=(29+71)×84
=100×84
=8400;
(4)34÷17+29÷17+27÷17+46÷17
=(34+29+27+46)÷17
=136÷17
=8.
=1750×3-(4+3+2)
=5250-9
=5241;
(2)7.81×48+78.1×4.1+0.78×90
=7.81×48+7.81×41+0.78×90
=(48+41)×7.81+0.78×90
=89×7.81+0.78×90
=(7.81+0.78)×90-7.81
=773.1-7.81
=765.29;
(3)38×29+84×71+46×29
=(38+46)×29+84×71
=84×29+84×71
=(29+71)×84
=100×84
=8400;
(4)34÷17+29÷17+27÷17+46÷17
=(34+29+27+46)÷17
=136÷17
=8.
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