Giải chi tiết
a: =>5(x+5)=30
=>x+5=6
=>x=1
b: =>2(x-16)=56
=>x-16=28
=>x=44
c: =>215-(3x-24)=1040
=>3x-24=1040-215=825
=>3x=849
hay x=283
\(91-5.(5+x)=61\)
\(5.(5+x)=91-61\)
\(5.(5+x)=30\)
\(5+x=30:5\)
\(5+x=6\)
\(x=6-5\)
\(x=1\)
\(----------------\)
\(\left[\left(x+34\right)-50\right].2=56\)
\(\left[\left(x+34\right)-50\right]=56:2\)
\(\left[\left(x+34\right)-50\right]=28\)
\(x+34=28+50\)
\(x+34=78\)
\(x=78-34\)
\(x=44\)
\(--------------\)
\(1045-\left[215-\left(3x-24\right)\right]=5\)
\(215-(3x-24)=1045-5\)
\(215-(3x-24)=1040\)
\(3x-24=215-1040\)
\(3x-24= -825\)
\(3x= -825+(24)\)
\(3x= -801\)
\(x=-801:3\)
\(x= -267\)
\(-------------------\)
\(\left[195-\left(15x-27\right)\right]2.39=4212\)
\(195-(15x-27)=4212:39\)
\(195-(15x-27)= 108 \)
\(15x-27= 195-108\)
\(15x-27= 87 \)
\(15x= 87+27\)
\(15x= 114\)
\(x= 114:15\)
\(x=7,6\)
\(-------------\)
\(30-3(x-2)=18\)
\(3(x-2)=30-18\)
\(3(x-2)=12\)
\(x-2=12:3\)
\(x-2=4\)
\(x=4+2\)
\(x=6\)
Giải chi tiết
Giải chi tiết