(21× x+ 3) ×4=84
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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 ~
\(a,x+23-19+48=-50\)
\(\Rightarrow x=-50-23+19-48\)
\(\Rightarrow x=-102\)
\(\left(21\times x+3\right)\times4=84\)
\(\Rightarrow\left(21\times x+3\right)=84\div4\)
\(\Rightarrow\left(21\times x+3\right)=21\)
\(\Rightarrow21\times x=21-3\)
\(\Rightarrow21\times x=18\)
\(\Rightarrow x=18\div21\)
\(\Rightarrow x=\frac{6}{7}\)