Toán Tìm x, biết : a) 4x ÷ 17 = 0 b) 7x – 8 = 6 c) 8. ( x – 3 ) = 0 d) ( x + 5 ) .7 = 0 22/07/2021 By Iris Tìm x, biết : a) 4x ÷ 17 = 0 b) 7x – 8 = 6 c) 8. ( x – 3 ) = 0 d) ( x + 5 ) .7 = 0
a) 4x ÷ 17 = 0 4x = 0.17 4x = 0 x = 0÷4 x = 0 Vậy x = 0 b) 7x – 8 = 6 7x = 6+8 7x = 14 x = 14÷7 x = 2 Vậy x =2 c) 8. ( x – 3 ) = 0 x-3 = 0÷8 x-3 =0 x =0+3 x =3 Vậy x = 3 d) ( x + 5 ) .7 = 0 x+5 = 0÷7 x+5 =0 x =0-5 x =-5 Vậy x = -5 Trả lời
a) $4x÷17=0$ $4x=0.17$ $4x=0$ $x=0:4$ $x=0$ Vậy $x=0$ b) $7x-8=6$ $7x=6+8$ $7x=14$ $x=14:7$ $x=2$ Vậy $x=2$ c) $8.(x-3)=0$ $x-3=0:8$ $x-3=0$ $x=0+3$ $x=3$ Vậy $x=3$ d) $(x+5).7=0$$x+5=0:7$ $x+5=0$ $x=0-5$ $x=-5$ Vậy $x=-5$ Trả lời