Tính nhanh: (-183). (26-17) -17. (183+26)
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22 tháng 1 2017
(-183)x(26-17)-17x(183+26)
=-183x26-(-183x17)-17x183+17x26
=-183x26+17x26+(-183x17)-17x183
=26x(183+17)+0
=26x200
=5200
22 tháng 1 2019
a) 17.(-183)+17.83
= 17.(-183+83)
= 17.100=1700
b) (-27).145+27.45
= 27.(-145)+27.45
= 27.(-145+45)
= 27.100=2700
c) -38.(25-4)+25.(-4+38)
= -38.25-(-38).4+25.(-4)+25.38
= -38.25+25.38+38.4+25.(-4)
= 0+38.4+(-25).4
= 4.(-25+38)
= 4.13=52
d) 23.(145-17)-145.(23-37)
= (23.145-23.17)-(145.23+145.37)
= [23.(145-17)]-[145.(23+37)]
= (23.128)-(145.60)
= 2944-8700=-5756
N
5
B
13 tháng 9 2020
Bài làm :
Ta có :
\(183^2-197.203+17^2+2.183.17\)
\(=\left(183^2+2.183.17+17^2\right)-\left(197.203\right)\)
\(=\left(183+17\right)^2-\left(200-3\right).\left(200+3\right)\)
\(=200^2-\left(200^2-9\right)\)
\(=200^2-200^2+9\)
\(=9\)
23 tháng 11 2021
\(\dfrac{33}{38}:\dfrac{11}{19}=\dfrac{33\times19}{38\times11}=\dfrac{3\times1}{2\times1}=\dfrac{3}{2}\)
1 tháng 8 2017
(98x17—17x26):72
=17x(98—26):72
=17x72:72
=17x1
=17
2 tháng 3 2022
1. There was too much snow for us to go camping.
- There was such much snow that we couldn't go camping ________________________________________
2. The garden is too small for us to play football in.
- It is such a small garden that we can't play football in _________________________________________________ .
3. She walks slowly because of her carelessness.
- Because of her carelessness, she walks slowly __________________________________________ .
4. We can't swim in this part of the river because it is highly polluted.- Because of _________________________________________________ .
5. I'm tired because of staying up late watching TV.
- Because of staying up late watching TV, I'm tired___________________________________________________ .
(-183).(26-17)-17.(183+26)
=(-183).26-(-183).17-(17.183+17.26)
=(-183).26-(-183).17-17.183-17.26
=(-183).26+(183.17-17.183)-17.26
=-183.26+0-17.26
=(-183+17).26
=-200.26
=-100.52
=-5200
Thks bạn!