Toán Lớp 6: a/7x+23=58 b/5x-35=75 c/(x-140):7=3mu3-2.3mu2 d60-3(x-3)=45

Question

Toán Lớp 6:  a/7x+23=58 b/5x-35=75 c/(x-140):7=3mu3-2.3mu2 d60-3(x-3)=45

lyly98 · Answer

Lời giải và giải thích chi tiết:   a) 7x + 23 = 58 7x = 58 - 23 7x = 35 x = 35 : 7 x = 5  b) 5x - 35 = 75 5x = 75 + 35 5x = 110 x = 22  c) ( x - 140 ) : 7 = 3^3 - 2.3^2 ( x - 140 ) : 7 = 27 - 2.9 ( x - 140 ) : 7 = 27 - 18 ( x - 140 ) : 7 = 9 x - 140 = 9 xx 7 x - 140 = 63 x = 63 + 140 x = 203  d) 60 - 3.(x-3) = 45 3.(x-3) = 60 - 45 3.(x-3) = 15 x - 3 = 15 : 3 x - 3 = 5 x = 5 + 3 x = 8

huenthanh97 · Answer

Answer    a, 7x + 23 = 58   => 7x = 58 - 23   => 7x = 35   => x = 35 : 7   => x = 5   ______________________   b, 5x - 35 = 75   => 5x = 75 + 35   => 5x = 110   => x = 110 : 5   => x = 22   ____________________   c, (x - 140) : 7 = 3^3 - 2 . 3^2   => (x - 140) : 7 = 27 - 18   => (x - 140) : 7 = 9   => x - 140 = 9 . 7   => x - 140 = 63   => x = 63 + 140   => x = 203   ______________________   d, 60 - 3 . (x - 3) = 45   => 3 . (x - 3) = 60 - 45   => 3 . (x - 3) = 15   => (x - 3) = 15 : 3   => x - 3 = 5   => x = 5 + 3   => x = 8