Tính nhanh: (-183). (26-17) -17. (183+26)
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Tính nhanh: (-183). (26-17) -17. (183+26)
(-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
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Thực hiện các phép tính ( tính nhanh nếu có thể )
A) 17 + 188 + 183
B) 80 - [ 130 - ( 12 - 4 )² ]
C) 2³ . 17 - 2³ .14
a) \(17+188+183=205+183=388\)
b) \(80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left(130-64\right)\)
\(80-66=14\)
c) \(2^3.17-2^3.14\)
\(8.17-8.14\)
\(=8.\left(17-14\right)\)
\(=8.3=24\)
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Tính nhanh 26*17+19*52+26*44+26
=26(17+19*2+44+1)
=26*100
=2600
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Tính nhanh:
a,17.(-183)+17.83
b,(-27).145+27.45
c,-38.(25-4)+25.(-4+38)
d,23.(145-17)-145.(23-37)
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
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A=5+(-7)+9+(-11)+13+(-15)+17+(-19)
B=455+(-311)+789+(-144)
C=183+(-150)+[120+(-183)+150]+(-20)
tinh nhanh nhecac ban
Tính nhanh: 1832 - 197.203 + 172 + 2.183.17
Bài này có dùng HĐT, mong mọi người chỉ dẫn.
Bài làm :
Ta có :
\(183^2-197.203+17^2+2.183.17\)
\(=\left(183^2+2.183.17+17^2\right)-\left(197.203\right)\)
\(=\left(183+17\right)^2-\left(200-3\right).\left(200+3\right)\)
\(=200^2-\left(200^2-9\right)\)
\(=200^2-200^2+9\)
\(=9\)
1832 - 197.203 + 172 + 2.183.17
= (1832 + 2.183.17 + 172) - 197.203
= (1832 + 2.183.17 + 172) - (200 - 3).(200 + 3)
= (183 + 17)2 - (2002 - 92)
= 2002 - 2002 + 92
= 92
= 81
Bạn Xyz sai từ dòng thứ 4 rồi nhé ; bạn có thể xem và sửa ở bài mình
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Tính nhanh:
\(\dfrac{17}{13}:\dfrac{51}{26}=\dfrac{17}{13}x\dfrac{26}{51}=\dfrac{17x13x2}{13x17x3}=\dfrac{2}{3}\)
\(\dfrac{33}{38}:\dfrac{11}{19}\)=?
\(\dfrac{33}{38}:\dfrac{11}{19}=\dfrac{33\times19}{38\times11}=\dfrac{3\times1}{2\times1}=\dfrac{3}{2}\)
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1) Tính nhanh
( 98 x 17 - 26 x 17 ) : 72
(98x17—17x26):72
=17x(98—26):72
=17x72:72
=17x1
=17
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1. There was too much snow for us to go camping.- There was such ________________________________________2. The garden is too small for us to play football in.- It is such _________________________________________________ .3. She walks slowly because of her carelessness.- Because of __________________________________________ .4. We cant swim in this part of the river because it is highly polluted.- Because of _________________________________________________ .5. Im tired because of staying up l...
Đọc tiếp
1. There was too much snow for us to go camping.
- There was such ________________________________________
2. The garden is too small for us to play football in.
- It is such _________________________________________________ .
3. She walks slowly because of her carelessness.
- Because of __________________________________________ .
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 ____________________________________________________ .
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___________________________________________________ .
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