[27 . (-67) + 33 . (-27)] : (-30)
=?
K
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1
CM
18 tháng 7 2019
a) 67 +135 + 33 = (67 + 33) +135 = 100 +135 - 235.
b) 56 + (47 + 44) = (56+44) + 47 = 100 + 47 = 147.
c)146 +121+54 + 379 = (146 + 54) + (121+379)
= 200 + 500 = 700.
d) 27 +132 + 237 + 868 + 763 = (237 + 763) + (132 + 868) + 27
= 1000 +1000 + 27 = 2027.
e) 22 + 23 + 24 +... + 27 + 28 = (22 + 28) + (23 + 27) + (24 + 26) + 25
= 50 + 50 + 50 + 25 = 175
10 tháng 1 2022
Sao mấy phép tính này là lớp 6 vậy??? Mấy phép tính này dễ mà!
CM
6 tháng 9 2017
a) 67 +135 + 33 = (67 + 33) +135 = 100 +135 - 235.
b) 56 + (47 + 44) = (56+44) + 47 = 100 + 47 = 147.
c)146 +121+54 + 379 = (146 + 54) + (121+379)
= 200 + 500 = 700.
d) 27 +132 + 237 + 868 + 763 = (237 + 763) + (132 + 868) + 27
= 1000 +1000 + 27 = 2027.
e) 22 + 23 + 24 +... + 27 + 28 = (22 + 28) + (23 + 27) + (24 + 26) + 25
= 50 + 50 + 50 + 25 = 175
HM
1
31 tháng 3 2016
(x-13)/87+(x-27)/73+(x-67)/33+(x-73)/27=4
=>(x-13-87)/87+(x-27-73)/73+(x-67-33)/33+(x-73-27)/27=4-1-1-1-1
=>(x-100)/87+(x-100)/73+(x-100)/33+(x-100)/27=0
=>(x-100)*(1/87+1/73+1/33+1/27)=0
=>x-100=0
=>x=100
TT
2 tháng 9 2020
Ta có :
\(\frac{x-3}{97}+\frac{x-27}{73}+\frac{x-67}{33}+\frac{x-73}{27}=4\)
\(\Leftrightarrow\left(\frac{x-3}{97}-1\right)+\left(\frac{x-27}{73}-1\right)+\left(\frac{x-67}{33}-1\right)+\left(\frac{x-73}{27}-1\right)=0\)
\(\Leftrightarrow\frac{x-100}{97}+\frac{x-100}{73}+\frac{x-100}{33}+\frac{x-100}{27}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\right)=0\)
Vì \(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}>0\) Nên \(x-100=0\)
\(\Leftrightarrow x=100\)
Vậy \(x=100\)
2 tháng 9 2020
\(\Leftrightarrow\frac{x-3}{87}+\frac{x-27}{79}+\frac{x-67}{33}+\frac{x-73}{27}-4=0\)
\(\Leftrightarrow\left(\frac{x-3}{97}-1\right)+\left(\frac{x-27}{73}-1\right)+\left(\frac{x-67}{33}-1\right)+\left(\frac{x-73}{27}-1\right)=0\)
\(\Leftrightarrow\left(\frac{x-3-97}{97}\right)+\left(\frac{x-27-73}{73}\right)+\left(\frac{x-67-33}{33}\right)+\left(\frac{x-73-27}{27}\right)=0\)
\(\Leftrightarrow\frac{x-100}{97}+\frac{x-100}{73}+\frac{x-100}{33}+\frac{x-100}{27}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\right)=0\)
Vì \(\frac{1}{97}+\frac{1}{73}+\frac{1}{33}+\frac{1}{27}\ne0\)
\(\Rightarrow x-100=0\Leftrightarrow x=100\)
25 tháng 1 2022
1: =66+34-73-27+99=99
2: =54-45+30-54-30+5=-40
3: =42-56+33-33+56-42=0
4: =50-47-50+18+47-18=0
5: =10-28+30-4=2-4+10=12-4=8
25 tháng 1 2022
\(\text{1.-(-66)+34+(-73)-27+99}.\)
\(=66+34-73-27+99=100-100+99=-99.\)
\(\text{2.54-(45-30+54)-30+5}.\)
\(54-45+30-54-30+5=\left(54-54\right)+\left(-45+5\right)+\left(30-30\right)=-40.\)
\(\text{3.42-56+33-(33-56+42)}.\)
\(=42-56+33-33+56-42=\left(42-42\right)+\left(-56+56\right)+\left(33-33\right)=0.\)
\(\text{4.50-(47+50-18)+(47-18)}.\)
\(=50-47-50+18+47-18=\left(50-50\right)+\left(-47+47\right)+\left(18-18\right)=0.\)
\(\text{5.10-(28-30+4)}.\)
\(=10-28+30-4=10+30-20-8-4=20-12=8.\)
\(\text{6.-(-73)+(44-94+27)+94}.\)
\(=73+44-94+27+94=\left(73+27\right)+\left(-94+94\right)+44=100+44=144.\)
\(\left[27\cdot\left(-67\right)+33\cdot\left(-27\right)\right]:\left(-30\right)\)
⇔\(\left[27\cdot\left(-67\right)+\left(-33\right)\cdot27\right]:\left(-30\right)\)
⇔\(\left\{27\left[\left(-67\right)+\left(-33\right)\right]\right\}:\left(-30\right)\)
\(=\left\{27\cdot\left(-100\right)\right\}:\left(-30\right)\)
\(=\left(-2700\right):\left(-30\right)\)
\(=900\)
\(PeaGea\)