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

Toán Lớp 6: 4/ 2792 – (13 . x + 90 ) : 4 = 2295 5/ 5729 – ( x – 425) .3 = 5528 6/ 275- (113 -x).2 + 63=158 7/ 53+ (18x – 65).3 = 262+10 8/ 15.x –

Toán Lớp 6: 4/ 2792 – (13 . x + 90 ) : 4 = 2295
5/ 5729 – ( x – 425) .3 = 5528
6/ 275- (113 -x).2 + 63=158
7/ 53+ (18x – 65).3 = 262+10
8/ 15.x – 2825 = 28.75 -14 .70 + 28.60
Giúp mình hứa trả cảm ơn và 5 sao
làm đúng + không lộn xộn

Comments ( 1 )

  1. Giải đáp: 4/ 2792 – (13 . x + 90 ) : 4 = 2295
    ⇒(13.x+90):4=2792-2295
    ⇒(13.x+90):4=497
    ⇒13.x+90=497.4
    ⇒13.x+90=1988
    ⇒13x=1988-90
    ⇒13x=1898
    ⇒x=1898:13=146
    5/ 5729 – ( x – 425) .3 = 5528
    ⇒(x-425).3=5729-5528
    ⇒(x-425).3=201
    ⇒x-425=201:3
    ⇒x-425=67
    ⇒x=67+425=492
    6/ 275- (113 -x).2 + 63=158
    ⇒275- (113 -x).2=158-63
    ⇒275- (113 -x).2=95
    ⇒(113 -x).2=275-95
    ⇒(113 -x).2=180
    ⇒113 -x=180:2
    ⇒113 -x=90
    ⇒x=113-90=23
    7/ 53+ (18x – 65).3 = 262+10
    ⇒53+(18x – 65).3=272
    ⇒(18x – 65).3=272-53
    ⇒(18x – 65).3=219
    ⇒18x – 65=219:3
    ⇒18x – 65=73
    ⇒18x=73+65
    ⇒18x=138
    ⇒x=138:18=23/3
    8/ 15.x – 2825 = 28.75 -14 .70 + 28.60
    ⇒15x-2825=(28.75+ 28.60)-14 .70
    ⇒15x-2825=28.(75+60)-14.70
    ⇒15x-2825=28.135-14.70
    ⇒15x-2825=28.135-14.2.35
    ⇒15x-2825=28.135-28.35
    ⇒15x-2825=28.(135-35)
    ⇒15x-2825=28.100=2800
    ⇒15x=2800+2825
    ⇒15x=5625
    ⇒x=5625:15=375
     

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