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

Toán Lớp 6: a, 4,25 x 57,43 – 325 + 42,57 x 4,25

Toán Lớp 6: a, 4,25 x 57,43 – 325 + 42,57 x 4,25 b, 67,49 : 17 + 32,45 : 2,5

c, (75,6 – 21,7) : 4 + 22,82 x 2
d, 1+1/3+1/9+1/27+1/81

Comments ( 2 )

  1. a, 4,25 x 57,43 – 325 + 42,57 x 4,25
    =( 4,25 x 57,43 + 42,57 x 4,25)– 325
    = 4,25 x (57,43 + 42,57 )-325
    = 4,25 x 100- 325
    =400-325=75
    b, 67,49 : 17 + 32,45 : 2,5
    = 3,97 + 12,98
    = 16,95
    c, (75,6 – 21,7) : 4 + 22,82 x 2
    = 53,9 : 4 + 45,64
    = 13,475 + 45,64
    = 59,115
    d, 1+1/3+1/9+1/27+1/81
    đặt S=1+1/3+1/9+1/27+1/81
    3S=3×(1/3+1/9+1/27+1/81)
    3S = 1+ ( 1/3 + 1/9 + 1/27)
    3S = 1 + A – 1/81
    2S = 1 – 1/81
    2S =80/81
    S   =80/81: 2
    S   =40/81

  2. Giải đáp + Lời giải và giải thích chi tiết:
    $a)4,25*57,43-325+42,57*4,25$
    $=( 4,25 x 57,43 + 42,57 x 4,25)– 325$
    $= 4,25 x (57,43 + 42,57 )-325$
    $= 4,25 x 100- 325$
    $=400-325$
    $=75$
    $b)67,49:17+32,45:2,5= 3,97 + 12,98= 16,95$
    $c)(75,6-21,7):4+22,82*2= 53,9 : 4 + 45,64= 13,475 + 45,64= 59,115$
    $d)1+1/3+1/9+1/27+1/81$
    Đặt $A=1+1/3+1/9+1/27+1/81$
    $⇒3A=3×(1/3+1/9+1/27+1/81)$
    $3A = 1+ ( 1/3 + 1/9 + 1/27)$
    $3A = 1 + A – 1/81$
    $2A = 1 – 1/81$
    $2A =80/81$
    $A   =80/81: 2$
    $A   =40/81$
    Mk xin hay nhất ạ 

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

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