Toán Lớp 4: 1)-4(x+1)+(89x-3)=24 2)5x-30-2(x+6)=9 3)-3(x-5)+6(x+2)=9 4)7(x-9)-5(6-x)=-6+11x 5)10(x-7)-8(x+5)=6.(-5)+24 ai làm n

Question

Toán Lớp 4:  1)-4(x+1)+(89x-3)=24 2)5x-30-2(x+6)=9 3)-3(x-5)+6(x+2)=9 4)7(x-9)-5(6-x)=-6+11x 5)10(x-7)-8(x+5)=6.(-5)+24                     ai làm nhanh và đúng tôi cho 5 sao nè!! ^^

truongthanhhung · Answer

1) -4(x+1) + (89x -3) = 24         -4x - 4 + 89x - 3 = 24                        85x - 7 = 24                              85x = 24 + 7 = 31                                  x = 31/85    vậy x = 31/85    2) 5x - 30 - 2(x+6) = 9        5x - 30 - 2x - 12 = 9                       3x - 42 = 9                               3x = 9 + 42 = 51                                 x = 17    vậy x = 17    3) -3(x - 5) + 6(x + 2 ) = 9         -3x + 15 + 6x + 12 = 9                           3x + 27 = 9                                    3x = 9 - 27 = -18                                      x = -6    4) 7(x-9) - 5(6 - x) = -6 + 11x      7x - 63 - 30 + 5x = -6 + 11x                    12x - 93 = -6 + 11x                  12x - 11x = -6 + 93                               x = 87    vậy x = 87    5) 10(x - 7) - 8(x + 5) = 6. (-5) + 24          10x - 70 - 8x - 40 = -30 + 24                        2x - 110 = -6                                  2x = -6 + 110 = 104                                    x = 104 : 2 = 52    vậy x = 52      xin hay nhất

kimoanh34 · Answer

1) -4(x+1) + (89x -3) = 24         -4x - 4 + 89x - 3 = 24                        85x - 7 = 24                              85x = 24 + 7 = 31                                  x = 31/85    vậy x = 31/85    2) 5x - 30 - 2(x+6) = 9        5x - 30 - 2x - 12 = 9                       3x - 42 = 9                               3x = 9 + 42 = 51                                 x = 17    vậy x = 17    3) -3(x - 5) + 6(x + 2 ) = 9         -3x + 15 + 6x + 12 = 9                           3x + 27 = 9                                    3x = 9 - 27 = -18                                      x = -6    4) 7(x-9) - 5(6 - x) = -6 + 11x      7x - 63 - 30 + 5x = -6 + 11x                    12x - 93 = -6 + 11x                  12x - 11x = -6 + 93                               x = 87    vậy x = 87    5) 10(x - 7) - 8(x + 5) = 6. (-5) + 24          10x - 70 - 8x - 40 = -30 + 24                        2x - 110 = -6                                  2x = -6 + 110 = 104                                    x = 104 : 2 = 52    vậy x = 52