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能简算的要简算.28.7+1.62+3.38+1.314.78-4.68-5.32104×255.9+0.3-5.9+0.3565-19989×102-89×2176×54+176×47-176458+29815.64-(2.4+5.64)599×99+401×9977×99+77(40-4
题目详情
能简算的要简算. 28.7+1.62+3.38+1.3 | 14.78-4.68-5.32 | 104×25 |
5.9+0.3-5.9+0.3 | 565-199 | 89×102-89×2 |
176×54+176×47-176 | 458+298 | 15.64-(2.4+5.64) |
599×99+401×99 | 77×99+77 | (40-4)×25 |
▼优质解答
答案和解析
(1)28.7+1.62+3.38+1.3
=(28.7+1.3)+(1.62+3.38)
=30+5
=35
(2)14.78-4.68-5.32
=14.78-(4.68+5.32)
=14.78-10
=4.78
(3)104×25
=(100+4)×25
=100×25+4×25
=2500+100
=2600
(4)5.9+0.3-5.9+0.3
=(5.9-5.9)+(0.3+0.3)
=0.6
(5)565-199
=565-(200-1)
=565-200+1
=365+1
=366
(6)89×102-89×2
=89×(102-2)
=89×100
=8900
(7)176×54+176×47-176
=176×(54+47-1)
=176×100
=17600
(8)458+298
=458+(300-2)
=458+300-2
=758-2
=756
(9)15.64-(2.4+5.64)
=15.64-2.4-5.64
=(15.64-5.64)-2.4
=10-2.4
=7.6
(10)599×99+401×99
=(599+401)×99
=1000×99
=99000
(11)77×99+77
=77×(99+1)
=77×100
=7700
(12)(40-4)×25
=40×25-4×25
=1000-100
=900
=(28.7+1.3)+(1.62+3.38)
=30+5
=35
(2)14.78-4.68-5.32
=14.78-(4.68+5.32)
=14.78-10
=4.78
(3)104×25
=(100+4)×25
=100×25+4×25
=2500+100
=2600
(4)5.9+0.3-5.9+0.3
=(5.9-5.9)+(0.3+0.3)
=0.6
(5)565-199
=565-(200-1)
=565-200+1
=365+1
=366
(6)89×102-89×2
=89×(102-2)
=89×100
=8900
(7)176×54+176×47-176
=176×(54+47-1)
=176×100
=17600
(8)458+298
=458+(300-2)
=458+300-2
=758-2
=756
(9)15.64-(2.4+5.64)
=15.64-2.4-5.64
=(15.64-5.64)-2.4
=10-2.4
=7.6
(10)599×99+401×99
=(599+401)×99
=1000×99
=99000
(11)77×99+77
=77×(99+1)
=77×100
=7700
(12)(40-4)×25
=40×25-4×25
=1000-100
=900
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