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

Toán Lớp 5: e) 3/4 nhân x – 3/2 =9/2 f) ( 3/20 + 1/2 -x) :32/9 = 21/128 g) 420 : [75- (x-10) ] =21 h) [ 25- (x+1,85) ] :3=7 i) X x 2/3 + 1/5 x X=26

Tháng Một 31, 2023 Toán học 2 Comments 0 views

Toán Lớp 5: e) 3/4 nhân x – 3/2 =9/2
f) ( 3/20 + 1/2 -x) :32/9 = 21/128
g) 420 : [75- (x-10) ] =21
h) [ 25- (x+1,85) ] :3=7
i) X x 2/3 + 1/5 x X=26,15
k) 3/4 x X -1/4x X +2 x X=3

Comments ( 2 )

  1. giahan44
    giahan44
    31 Tháng Một, 2023 at 4:01 chiều
    Reply
    Giải đáp: 
    e, 3/4xx x-3/2=9/2
    3/4xx x=9/2+3/2
    3/4xx x=6
    x=6:3/4
    x=8
    f, (3/20+1/2-x):32/9=21/128
    3/20+1/2-x=21/128xx32/9
    3/20+1/2-x=7/12
    13/20-x=7/12
    x=13/20-7/12
    x=1/15
    g, 420:[75-(x-10)]=21
    75-(x-10)=420:21
    75-(x-10)=20
    x-10=75-20
    x-10=55
    x=55+10
    x=65
    h, [25-(x+1,85)]:3=7
    25-(x+1,85)=7xx3
    25-(x+1,85)=21
    x+1,85=25-21
    x+1,85=4
    x=4-1,85
    x=2,15
    i, x xx 2/3+1/5xx x=26,15
    x xx(2/3+1/5)=26,15
    x xx 13/15=26,15
    x = 26,15:13/15
    x=1569/52
    k, 3/4 xx x-1/4 xx x+2 xx x=3
    x xx(3/4-1/4+2)=3
    x xx 5/2=3
    x=3:5/2
    x=6/5

  2. maingocquynhnhu2k1
    maingocquynhnhu2k1
    31 Tháng Một, 2023 at 4:01 chiều
    Reply
    e)3/4 . x-3/2=9/2
    =>3/4 . x=9/2+3/2
    =>3/4 . x=12/2=6
    =>x=6:3/4
    =>x=8
    f)(3/20+1/2-x):32/9=21/128
    =>3/20+1/2-x=21/128 . 32/9
    =>13/20-x=7/12
    =>x=13/20-7/12
    =>x=1/15
    g)420:[75-(x-10)]=21
    =>75+10-x=420:21
    =>85-x=20
    =>x=85-20
    =>x=65
    h)[25-(x+1,85)]:3=7
    =>25-1,85-x=7.3
    =>23,15-x=21
    =>x=23,15-21
    =>x=2,15
    i)x . 2/3+1/5 . x =26,15
    =>(2/3+1/5)x=26,15
    =>13/15 . x=26,15
    =>x=26,15:13/15
    =>x=1569/52
    k)3/4 . x – 1/4 . x +2.x=3
    =>(3/4-1/4+2)x=3
    =>(1/2+2)x=3
    =>5/2 . x=3
    =>x=3:5/2
    =>x=6/5

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

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