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a) 541+ ( 218 - x ) = 735
218 - x = 735 - 541
218 - x = 194
x= 218 - 194
x= 24
b) 12 . x - 33 = 32 . 33
12 . x - 33 = 9 . 27
12 . x - 33 = 243
12 . x = 243 + 33
12 . x = 276
x = 276 : 12
x = 23
c) 231 - ( x-6 ) = 1339 : 13
231 - ( x- 6) = 103
x- 6 = 231- 103
x-6 = 128
x= 128 + 6
x = 134
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Bài làm :
\(a,541+\left(218-x\right)=735\)
\(218-x=735-541\)
\(218-x=194\)
\(x=218-194\)
\(x=24\)
\(b,12.x-33=3^2.3^3\)
\(12x=243+33\)
\(12x=276\)
\(x=23\)
\(c,231-\left(x-6\right)=1339:13\)
\(x-6=231-103\)
\(x-6=128\)
\(x=134\)
\(d,2.x-138=2^3.3^2\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=105\)
\(e,2^x.4=128\)
\(2^x=128:4\)
\(2^x=32\)
\(2^x=2^5\)
\(\Rightarrow x=5\)
\(g,x^5=x\)
\(\Rightarrow\orbr{\begin{cases}x=0\\x=1\end{cases}}\)
Học tốt
a)[(6x-72)/2-84]/28=5628
(6x-72)/2-84=5628*28
3x-36-84=157584
3x=157584+36+84
3x=157704
x=157704/3
x=52568
b)14(x-3)-138=8*9
14(x-3)=72+138
x-3=210/14
x-3=15
x=15+3
x=18
c)2*3x-2*92=4*33
2*(3x-34)=2*2*33
3x=54+81
3x=135
nên x\(\in\phi\)
a) \(\text{2(x-51)=2.2^2+20}\)
\(2\left(x-51\right)=2.4+20\)
\(2\left(x-51\right)=28\)
\(x-51=28\div2\)
\(x-51=14\)
\(x=14+51\)
\(\text{b)3.(x+1)-26=541}\)
\(3.\left(x+1\right)=541+26\)
\(3\cdot\left(x+1\right)=567\)
\(x+1=567\div3\)
\(x+1=189\)
\(x=189-1\)
\(x=188\)
\(x=65\)
\(\text{c)4(x-3)=7^2-1^10}\)
\(4\left(x-3\right)=49-1\)
\(4\left(x-3\right)=48\)
\(x-3=48\div4\)
\(x-3=12\)
\(x=12+3\)
\(x=15\)
\(\text{e)2x-138=2^3.3^2}\)
\(2x-138=8\cdot9\)
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=210\div2\)
\(x=105\)
\(\text{f)(x-1)^4=16}\)
\(\left(x-1\right)^4=2^4\)
\(x-1=2\)
\(x=2+1\)
\(x=3\)
`2 xx y - 138 = 2560`
`2 xx y = 2560 + 138`
`2 xx y = 2698`
`y = 1349`
Vậy `y = 1349`
2 x y - 138 = 80 + 8 x 4
2 x y − 138 = 2560
2 x y = 2560 + 1382
2 x y = 2698
y = 2698 : 2
y = 1349
2.x -138=2^3.3^2
2.x - 138 = 72
2x = 72 + 138 = 210
x= 210 : 2
V x= 105
k mk nhe!!
2.x-138=23.32
2.x-138=72
2.x =72+138
2.x =210
x =210:2
x =105
Ok!
\(2x-138=2\cdot3\)
\(\Leftrightarrow2x-138=6\)
\(\Leftrightarrow2x=144\)
\(\Leftrightarrow x=72\)
\(2.x-138=2.3\)
\(2x-138=6\)
\(2x=6+138\)
\(2x=144\)
\(x=144:2\)
\(x=72\)
Học tốt