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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Tìm số tự nhiên x biết a) 5729 – ( x – 425) .3 = 5528 b) 275- (113 -x).2 + 63=158 c) 53+ (18x – 65).3 = 262+10 d) 15.x – 2825 = 28.75 –

Toán Lớp 6: Tìm số tự nhiên x biết
a) 5729 – ( x – 425) .3 = 5528
b) 275- (113 -x).2 + 63=158
c) 53+ (18x – 65).3 = 262+10
d) 15.x – 2825 = 28.75 -14 .70 + 28.60

Comments ( 1 )

  1. a) 5729 – ( x – 425) .3 = 5528
    => ( x – 425) .3= 5729-5528
    => ( x – 425) .3=201
    => x-425=67
    => x=67+425
    => 492
    Vậy x=492
    b) 275- (113 -x).2 + 63=158
    => (113 -x).2 + 63=275-158
    => (113 -x).2 + 63= 117
    => (113 -x).2= 117-63
    => (113 -x).2= 54
    => 113-x=54:2
    => 113-x=27
    => x=113-27
    => x= 86
    Vậy x=86
    c) 53+ (18x – 65).3 = 262+10
    => 53+ (18x – 65).3=272
    => (18x – 65).3= 53-272
    => (18x – 65).3=-219
    => 18x-65= -219:3
    => 18x-65= -73
    => 18x=-73+65
    => 18x= -8
    => x= -4/9
    d) 15.x – 2825 = 28.75 -14 .70 + 28.60
    => 15x-2825= 28(75+60)-14.70
    => 15x-2825= 28. 135-14.70
    => 15x-2825=14.2.135-14.70
    => 15x-2825= 14.270-14.70
    => 15x-2825= 14(270-70)
    => 15x-2825= 14.200
    => 15x-2825= 2800
    => 15x= 2800+2825
    => 15x= 5625
    => x= 5625:15
    => x= 375
    Vậy x=375

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222-9+11+12:2*14+14 = ? ( )

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