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= 12 : {390 : [ 500 - ( 125+245)]}
= 12 : {390 : [ 500 - 370]}
= 12 : { 390 : 130 }
= 12 : 3
= 4
A = 12 : {390 : [500 - (125 + 35.7)]}
A = 12 : {390 : [500 - (125 + 245)]}
A = 12 : {390 : [500 - 370]}
A = 12 : {390 : 130}
A = 12 : 3 = 4
B = 12000 - (1500 . 2 + 1800.3 + 1800.2 : 3)
B = 12000 - (3000 + 5400 + 1200)
B = 12000 - 9600 = 2400
C = \(\frac{11\cdot3^{22}\cdot3^7-9^{15}}{\left(2\cdot3^{14}\right)^2}=\frac{11\cdot3^{22}\cdot3^7-\left(3^2\right)^{15}}{2^2\cdot3^{28}}=\frac{11\cdot3^{29}-3^{30}}{2^2\cdot3^{28}}=\frac{11\cdot3\cdot3^{28}-3^2\cdot3^{28}}{2^2\cdot3^{28}}\)
\(=\frac{33\cdot3^{28}-9\cdot3^{28}}{4\cdot3^{28}}=\frac{\left(33-9\right)\cdot3^{28}}{4\cdot3^{28}}=\frac{24}{4}=6\)
a)80-[130-(12-40)2] b)27.75+25.27-150 c)12:{390:[500-(125+35.7)]}
=80-[130-(-28)2] =27.(75+25)-150 =12:{390:[500-(125+245)]}
=80-[130-784] =27.100-150 =12:{390:[500-370]}
=80-(-654) =2700-150 =12:{390:130}
=80+654 =2550 =12:3
=734 =4
Nhớ **** thanks so much^__^
=12:{390:[500-(125+245)]}
=12:{390:[500-370]}
=12:{390:130}
=12:3
=4
= 12 : {390 : [500 - (125 + 245) ] } = 12 : [390 : (500 - 370)] = 12 : (390 : 130) = 12: 3 = 4
a) 73 + 362 + 163 + 138 + 27 + 237
= (73 + 27) + (362 + 138) + (163 + 237)
= 100 + 500 + 400
= 1000
b) \(5^4\cdot5^6+3\cdot2^2-10^0\)
\(=5^{10}+3\cdot4-1\)
\(=9765625+12-1\)
\(=9765636\)
a.390 - (x - 7) = 169 : 13
390 - (x - 7) = 13
x - 7 = 390 - 13
x = 377 + 7
x = 384
b.(x - 140) : 7 = 33 - 23.3
(x - 140) : 7 = 3
x - 140 = 3 . 7
x = 21 + 140
x = 161
c.x - 6:2 - (48-24):2: 6-3 = 0
x - 3 -2 - 3 = 0
x = 3 + 2 + 3
x = 8
\(a.390-\left(x-7\right)=169:13\)
\(390-\left(x-7\right)=13\)
\(\left(x-7\right)=390-13\)
\(x-7=377\)
\(x=377+7\)
Vậy \(x=384\)
\(b.\left(x-140\right):7=3^3--2^3.3\)
\(\left(x-140\right):7=3^3+2^3.3\)
\(\left(x-140\right):7=27+8.3\)
\(\left(x-140\right):7=27+24\)
\(\left(x-140\right):7=51\)
\(\left(x-140\right)=51.7\)
\(x-140=357\)
\(x=357+140\)
Vậy \(x=497\)
\(c.x-6:2-\left(48-24\right):2:6-3=0\)
\(x-3-24:2:6-3=0\)
\(x-3-12:6-3=0\)
\(x-3-2-3=0\)
\(x-\left(-2\right)=0\)
\(x+2=0\)
\(x=0-2\)
Vậy \(x=-2\)
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