X+18-102=357
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a) = (-357) - 156 + 357 + 56
= (-357 + 357) + (-156 +56)
= 0 + (-100)
= -100
b) = (-4) .(-25) .123
= 100 .123
= 12300
c) = -144 - 18 + 45
= -162 + 45
= -117
Chúc bạn học tốt !
a,\(2x+12-18=x+4-18\)
\(\Rightarrow2x-x=4-1+18-12\)
\(\Rightarrow x=9\)
b,\(-5x+10-102=-6x-102\)
\(\Rightarrow-5x+6x=-102+102-10\)
\(\Rightarrow x=-10\)
a, 2x + 12 - 18 = x + 4 - 18
2x -x = 4 - 18 - 12 + 18
x = - 8
b, - 5x + 10 - 102 = - 6x - 102
- 5x + 6x = -102 - 10 + 102
x = - 10
VERY GOOD!!!
`@` `\text {Ans}`
`\downarrow`
`456 \div 2 \times 18 + 456 \div 3 - 102`
`= 456 \times 1/2 \times 18 + 456 \times 1/3 - 102`
`= 456 \times (1/2 \times 18 + 1/3) - 102`
`= 456 \times ( 9 + 1/3) - 102`
`= 456 \times 28/3 - 102`
`= 4256 - 102`
`= 4154`
a) (102 − 15) − (15 − x) = 6
102 − 15 − 15 + x = 6
x = 6 − 102 + 15 + 15
x = −66.
b) −154 + (x − 9 − 18) = 40
−154 + x − 9 – 18 = 40
x = 40 + 154 + 9 + 18
x = 221.
`@` `\text {Ans}`
`\downarrow`
`456 \div2\times18 + 456\div3 - 102`
`= 456\times0,5\times18 + 456\times1/3 - 102`
`= 456\times (0,5 \times 18 + 1/3) - 102`
`= 456 \times(9 + 1/3) - 102`
`= 456 \times28/3 - 102`
`= 4256 - 102`
`= 4154`
\(\frac{-7}{6}=\frac{x}{18}=\frac{-98}{y}=\frac{-14}{z}=\frac{t}{102}=\frac{u}{-18}\)
\(\text{+) }\frac{-7}{6}=\frac{x}{18}\)
\(\Rightarrow\left(-7\right).18=6.x\)
\(\Rightarrow-126=6.x\)
\(\Rightarrow x=-21\)
\(\text{+) }\frac{-7}{6}=\frac{-98}{y}\)
\(\Rightarrow\left(-7\right).y=6.\left(-98\right)\)
\(\Rightarrow y=\frac{6.\left(-98\right)}{-7}\)
\(\Rightarrow y=-84\)
\(\text{+) }\frac{-7}{6}=\frac{-14}{z}\)
\(\Rightarrow\left(-7\right).z=\left(-14\right).6\)
\(\Rightarrow\left(-7\right).z=-84\)
\(\Rightarrow z=12\)
\(\frac{-7}{6}=\frac{t}{102}\)
\(\Rightarrow\left(-7\right).102=t.6\)
\(\Rightarrow t=\frac{\left(-7\right).102}{6}=\frac{\left(-7\right).17.6}{6}\)
\(\Rightarrow t=-119\)
\(\frac{-7}{6}=\frac{u}{-18}\)
\(\Rightarrow\frac{-7}{6}=\frac{-u}{18}\)
\(\Rightarrow\left(-7\right).18=\left(-u\right).6\)
\(\Rightarrow-126=\left(-u\right).6\)
\(\Rightarrow-u=-21\)
\(\Rightarrow u=21\)
mình làm lộn mất tiêu!!
thế này mới đúng
456 :2 x 18 + 456: 3 -102 =
456 x (18 : 2) + 456 : 3 -102 =
456 x 9 + 456 : 3 -102 =
4154 + 102 -102=
4154 + 0= 4154
`-7/6=x/18`
`=>-21/18=x/18`
`=>x=-21(TM\ x in Z)`
`-7/6=-98/y`
`=>-98/84=-98/y`
`=>y=84(TM\ y in Z)`
`-7/6=-14/z`
`=>-14/12=-14/z`
`=>z=12(TM\ z in Z)`
`-7/6=t/102`
`=>-119/102=t/102`
`=>t=-119(TM\ t in Z)`
Vậy `(x,y,z,t)=(-21,84,12,-119)`
a) \(A=\frac{1}{5}+\frac{1}{45}+\frac{1}{117}+\frac{1}{221}+\frac{1}{357}+\frac{1}{525}\)
\(\Rightarrow A=\frac{1}{1.5}+\frac{1}{5.9}+\frac{1}{9.13}+...+\frac{1}{21.25}\)
\(\Rightarrow4A=\frac{4}{1.5}+\frac{4}{5.9}+\frac{4}{9.13}+...+\frac{4}{21.25}\)
\(4A=\frac{1}{1}-\frac{1}{5}+\frac{1}{5}-\frac{1}{9}+...+\frac{1}{21}-\frac{1}{25}\)
\(4A=\frac{1}{1}-\frac{1}{25}=\frac{24}{25}\)
\(\Rightarrow A=\frac{24}{25}\div4=\frac{6}{25}
x+18-102=357
X+18=357+102
X+18=459
X=459-18
X=441
x+ 18- 102 = 357
x + 18 = 357 + 102
x + 18 = 459
x = 459-18
x = 441