Toán Lớp 6: a) 7-x = 8- (-7) b) x-8 = ( -3) -8 c) 3+(-2) + x = 5 d) 4-( 27-3) = x-( 13-4) ai mlamf hộ mink vs

Question

Toán Lớp 6:  a) 7-x = 8- (-7)       b) x-8 = ( -3) -8         c)  3+(-2) + x = 5    d)   4-( 27-3) = x-( 13-4) ai mlamf hộ mink vs

lanminhngoc · Answer

a) 7 - x = 8 -(-7)     7 - x = 8 + 7 = 15           x = 7 - 15           x = -8     b) x - 8 = (-3) - 8     x - 8 = -11           x = -11 + 8           x = -3     c)3 + (-2) + x = 5                   3 + x = 5 - (-2) = 5 + 2                   3 + x = 7                          x = 7 - 3                          x = 4     d) 4 -( 27 - 3) = x - (13 - 4)         4 - 24 = x - (13 - 4)             -20 = x - (13 - 4)     x - 9 = -20           x = -20 + 9           x = -11

maingocquynhnhu2k1 · Answer

Gửi ak =))     a) 7 - x = 8 - ( - 7 )     => 7 - x = 8 + 7     => 7 - x = 15     => - x = 15 - 7     => - x = 8     => x = -8      b) x - 8 = ( - 3 ) - 8     => x - 8 = - 3 - 8     => x - 8 = - 11     => x = ( - 11 )  + 8     => x = -3     c) 3 + ( - 2 ) + x = 5     => 3 - 2 + x = 5     => 1 + x = 5     => x = 5 - 1     => x = 4     d) 4 - ( 27 - 3 ) = x - ( 13 - 4 )     => 4 - 24 = x - 9     => -20 = x - 9     => x = -20 + 9     => x = - 11