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195 :45 -60 :45 =(195-60):45 = 135 :60 =3
40:24+8:24=(40+8):24=48:24 =2
705 :45 -336 :45 = (705-336):45 = 369 :45 = 41/5
195 : 45 - 60 : 45
= (195-60):45
=135:45
=3
40 : 24 + 8 : 24
= (40+8) : 24
= 48:24
=2
705 : 45 - 336 : 45
=(705-336):45
=369:45
=8,2
Ta có:
45=5.32
195=5.3.13
ƯCLN(45;195)=5.3=15
ƯC(45;195)=Ư(15)={1;3;5;15}
45=5.32
195=5.3.13
ƯCLN(45;195)=5.3=15
ƯC(45;195)=Ư(15)={1;3;5;15}
\(36+3x=195\)
\(\Rightarrow3x=195-36=159\)
\(\Rightarrow x=159:3\)
\(\Rightarrow x=53\)
Vậy x = 53
\(27.3^x=3^6\)
\(\Rightarrow3^x=3^6:3^3\)
\(\Rightarrow3^x=3^3\)
Vậy x = 3
a) 998+ 45= 1043.
b) 57+ 195= 252.
c) 497+ 64= 561.
d) 25. 24= 600.
e) 49. 101= 4949.
g) 19. 64+ 76. 34= 3800.
h) 35. 12+ 65. 13= 1265.
\(\left[195-\left(3x-27\right)\right]\cdot39=4212\)
\(\Rightarrow\left(195-3x+27\right)\cdot39=4212\)
\(\Rightarrow\left(-3x+222\right)\cdot39=4212\)
\(\Rightarrow-3x+222=\dfrac{4212}{39}\)
\(\Rightarrow-3x+222=108\)
\(\Rightarrow3x=222-108\)
\(\Rightarrow3x=114\)
\(\Rightarrow x=\dfrac{114}{3}\)
\(\Rightarrow x=38\)
=>[195-(3x-27)]=4212:39=108
=>3x-27=195-108=87
=>3x=27+87=114
=>x=38
\(a,91-5.\left(5+x\right)=61\\ \Rightarrow=5.\left(5+x\right)=30\\ \Rightarrow5+x=6\\ \Rightarrow x=1.\\ b,\left[195-\left(3x-27\right)\right].39=4212\\ \Rightarrow195-\left(3x-27\right)=108\\ \Rightarrow3x-27=87\\ \Rightarrow3x=114\\ \Rightarrow x=38.\)
\(91-5.\left(5+x\right)=61\)
\(\Rightarrow5.\left(5+x\right)=91-61\)
\(\Rightarrow5.\left(5+x\right)=30\)
\(\Rightarrow5+x=\dfrac{30}{5}=6\)
\(\Rightarrow x=6-5=1\)
\(\left[195-\left(3x-27\right)\right].39=4212\)
\(\Rightarrow195-3x+27=\dfrac{4212}{39}=108\)
\(\Rightarrow222-3x=108\)
\(\Rightarrow3x=222-108=114\)
\(\Rightarrow x=\dfrac{114}{3}=38\)
3x+2{45-x-3[3x+7]-2x}+4x=55
<=>3x+2[45-x-9x-27-2x]+4x=55
<=>3x+90-2x-18x-54-4x+4x=55
<=>36-17x=55
<=>17x=-19
<=>x=-19/17
Vậy x=-19/17
\(3x+45=195\)
\(3x=195-45\)
\(3x=150\)
\(x=150:3\)
\(x=50\)
Dễ mà lấy tổng trừ hạng là ra