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a: =>-3x=1/21*84/5=4/5
=>x=-4/5:3=-4/15
b: =>-1/6x=-3/4-1/5=-19/20
=>x=19/20:1/6=19/20*6=57/10
\(311-x+82=46+x-21\)
\(393-x=x+25\)
\(x+x=393-25\)
\(2x=368\)
\(x=184\)
34+(21-x)=(3747-30)-3746
34+(21-x)=3717-3746
34+(21-x)=-29
21-x=-29-34
21-x=-63
x=21-(-63)
x=21+63
x=84
(x+153)-(48-193)=1-2-3-4
(x+153)-(48-193)=-8
(x+153)-(-145)=-8
(x+153)+145=-8
x+153=-8-145
x+153=-153
x=-153-153
x=0
35-(x+5)=315-(2x+135)
213-(x+84)= -161
x+84=213-(-161)
x+84=213+161
x+84=374
x=374-84
x=290
\(311-x+82=46+x-21\)
\(393-x=x+25\)
\(x+x=393-25\)
\(2x=368\)
\(x=184\)
\(-\left(x-3+84\right)=-x+70-71-5\)
\(-x+3-84=-x+70-71-5\)
\(-x-81=-x-6\)
\(-x+x=-6+81\)
\(0x=75\)
=> pt vô nghiệm
\(1)x+23-19+48=-50\)
\(\Rightarrow x+23-19=-50-48\)
\(\Rightarrow x+23-19=-98\)
\(\Rightarrow x+23=-98+19\)
\(\Rightarrow x+23=-79\)
\(\Rightarrow x=-79-23=-102\)
\(2)3x-27-21+84=12\)
\(\Rightarrow3x-27-21=12-84\)
\(\Rightarrow3x-27-21=12+(-84)\)
\(\Rightarrow3x-27-21=-72\)
\(\Rightarrow3x-27=-72+21\)
\(\Rightarrow3x-27=-51\)
\(\Rightarrow3x=-51+27\)
\(\Rightarrow3x=-24\)
\(\Rightarrow x=-24\div3=-8\)
Chúc bạn học tốt ~
\(a,x+23-19+48=-50\)
\(\Rightarrow x=-50-23+19-48\)
\(\Rightarrow x=-102\)
a) x-73=(57-x)-467
<=>x+x=57+73-467
<=>2x=-337
<=>x=-337/2
vậy ....
b) -(x - 3 - 84) = 70 - (-27) - 115
<=> -x + 3 + 84 = 70 +27 - 115
<=>-x=-105
<=>x=105
vậy ...
c) 231 - x + 62 = 46 + (x - 21)
<=> - x = 46 + x - 21-231-62
<=>-2x=-268
<=> x=134
vậy ...
d) -18 + x = -63 - (-33)
<=>x=-63+33+18
<=>x=-12
vậy ...
e) (x - 153) - (48 - 193) = 1 - 2 - 3 - 4
<=>x - 153 - 48 +193 = 1 - 2 - 3 - 4
<=> x= 0
vậy ...
84 : 4 + 27 : 21 + 5
= 21 + \(\frac{9}{7}\)+ 5
= \(\frac{156}{7}\) + 5
= \(\frac{191}{7}\)
a) 71-(33+x)=26
b) 135-5(x+4)=35
c) 25+(x-8)=106
d) 5x +x=39-33:27
e) 4 mũ x=64
f) 2 mũ x : 2 mũ 5=1
\(1.311-x+82=46+\left(x-21\right)\\ 311+82-x=46-21+x\\ 393-x=25+x\\ 393-x-25-x=0\\ 393-25-x-x=0\\ 368-2x=0\\ \Rightarrow-2x=368\\ x=368:\left(-2\right)\\ x=-184\)
\(2.-\left(x-3+85\right)=\left(x+70-71\right)-5\\ -x+3-85=x+70-71-5\\ -x-82=x-6\\ -x-82-x+6=0\\ -2x-76=0\\ -2x=76\\ x=76:\left(-2\right)\\ x=-38\)
\(3.\left(-x+821+534\right)=499+\left(x-84\right)\\ -x+821+534=499+x-84\\ -x+1355=x+415\\ -x+1355-x-415=0\\ -2x+940=0\\ -2x=-940\\ x=-940:\left(-2\right)\\ x=470\)
\(4.x+96=\left(443-x\right)-447\\x+96=443-x-447\\ x+96=-x-4\\ x+96+x+4=0\\ 2x+100=0\\ 2x=-100\\ x=-100:2\\ x=-50 \)
\(\left(21\times x+3\right)\times4=84\)
\(\Rightarrow\left(21\times x+3\right)=84\div4\)
\(\Rightarrow\left(21\times x+3\right)=21\)
\(\Rightarrow21\times x=21-3\)
\(\Rightarrow21\times x=18\)
\(\Rightarrow x=18\div21\)
\(\Rightarrow x=\frac{6}{7}\)