Đáp án:
a ) (2x-7)+16=-21 b) 72-3.(5-x)=108 c) (x-11)^3+3^2.5=37
2x-7 =-21-16 3.(5-x) =72-108 (x-11)^3+9.5 =37
2x-7 =-37 3.(5-x) =-36 (x-11)^3+45 =37
2x = -37+7 5-x = -36:3 (x-11)^3 =37-45
2x =-30 5-x = -12 (x-11)^3=-8
x = -30:2 x = 5-(-12) x-11^3 =-8
x =-15 x = 17 x- 1331 =-8
vay x =-15 vay x=17 x =-8+1331
x =1323
vay x = 1323
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