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

Toán Lớp 6: B1:tính a)27:75+25.27-250 b)12:{390:[500-(125+35.7)]} c)39.213+87.39 d)2.5 ³-36:3 ²

Home/ Toán Lớp 6: B1:tính a)27:75+25.27-250 b)12:{390:[500-(125+35.7)]} c)39.213+87.39 d)2.5 ³-36:3 ²

Toán Lớp 6: B1:tính a)27:75+25.27-250 b)12:{390:[500-(125+35.7)]} c)39.213+87.39 d)2.5 ³-36:3 ²

Tháng Tám 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: B1:tính
a)27:75+25.27-250 b)12:{390:[500-(125+35.7)]}
c)39.213+87.39 d)2.5 ³-36:3 ² e)3 ³.18-3 ³.12
B2:viết biểu thức sau dưới dạng một lũy thừa
a)11^5:11 ² b)5^5:5 ²:5 c)3^4.3 ³.3 ² d)16 ²:4 ² e)25 ²:5 ²
B3:tìm x ∈ N biết:
a)541+(218-x)=735 b)5.(x+35)=515
c)96-3.(x+1)=42 d)12. x-33=3 ².3 ³

Comments ( 2 )

  1. daithanh
    daithanh
    17 Tháng Tám, 2022 at 2:49 sáng
    Reply
    Bài 1:
    a) 27 × 75 + 25 × 27 – 250
    = 27 × ( 75 + 25 ) – 250
    = 27 × 100 – 250
    = 2700 – 250
    = 2450
    b) 12 : { 390 : [ 500 – ( 125 + 35 × 7 )]}
    = 12 : ( 390 : [ 500 – ( 125 + 245 )]}
    = 12 : [ 390 : ( 500 – 370 )]
    = 12 : ( 390 : 130 )
    = 12 : 3
    = 4
    c) 39 × 213 + 87 × 39
    = 39 × ( 213 + 87 )
    = 39 × 300
    = 11700
    d) 2 × 5^3 – 36 : 3^2
    = 2 × 125 – 36 : 9
    = 250 – 4
    = 246
    e) 3^3 × 18 – 3^3 × 12
    = 27 × 18 – 27 × 12
    = 27 × ( 18 – 12 )
    = 27 × 6
    = 162
    Bài 2:
    a) 11^5 : 11^2 = 11^( 5 + 2 ) = 11^7
    b) 5^5 : 5^2 : 5 = 5^( 5 + 2 + 1 ) = 5^8
    c) 3^4 × 3^3 × 3^2 = 3^( 4 + 3 + 2 ) = 3^9
    d) 16^2 : 4^2 = ( 4 × 4 )^2 : 4^2 = 4^2 × 4^2 : 4^2 = 4^( 2 + 2 – 2 ) = 4^2
    e) 25^2 : 5^2 = ( 5 × 5 )^2 : 5^2 = 5^2 × 5^2 : 5^2 = 5^( 2 + 2 – 2 ) = 5^2
    Bài 3:
    a) 541 + ( 218 – x ) = 735
    218 – x = 735 – 541
    218 – x = 194
    x = 218 – 194
    x = 24
    b) 5 × ( x + 35 ) = 515
    x + 35 = 515 : 5
    x + 35 = 103
    x = 103 – 35
    x = 68
    c) 96 – 3 × ( x + 1 ) = 42
    3 × ( x + 1 ) = 96 – 42
    3 × ( x + 1 ) = 54
    x + 1 = 54 : 3
    x + 1 = 18
    x = 18 – 1
    x = 17
    d) 12 × x – 33 = 3
    12 × x = 3 + 33
    12 × x = 36
    x = 36 : 12
    x = 3
    @ Rin

  2. kimoanh34
    kimoanh34
    17 Tháng Tám, 2022 at 2:48 sáng
    Reply
    Bài 1:
    a) 27 × 75 + 25 × 27 – 250
    = 27 × ( 75 + 25 ) – 250
    = 27 × 100 – 250
    = 2700 – 250
    = 2450
    b) 12 : { 390 : [ 500 – ( 125 + 35 × 7 )]}
    = 12 : ( 390 : [ 500 – ( 125 + 245 )]}
    = 12 : [ 390 : ( 500 – 370 )]
    = 12 : ( 390 : 130 )
    = 12 : 3
    = 4
    c) 39 × 213 + 87 × 39
    = 39 × ( 213 + 87 )
    = 39 × 300
    = 11700
    d) 2 × 5^3 – 36 : 3^2
    = 2 × 125 – 36 : 9
    = 250 – 4
    = 246
    e) 3^3 × 18 – 3^3 × 12
    = 27 × 18 – 27 × 12
    = 27 × ( 18 – 12 )
    = 27 × 6
    = 162
    Bài 2:
    a) 11^5 : 11^2 = 11^( 5 + 2 ) = 11^7
    b) 5^5 : 5^2 : 5 = 5^( 5 + 2 + 1 ) = 5^8
    c) 3^4 × 3^3 × 3^2 = 3^( 4 + 3 + 2 ) = 3^9
    d) 16^2 : 4^2 = ( 4 × 4 )^2 : 4^2 = 4^2 × 4^2 : 4^2 = 4^( 2 + 2 – 2 ) = 4^2
    e) 25^2 : 5^2 = ( 5 × 5 )^2 : 5^2 = 5^2 × 5^2 : 5^2 = 5^( 2 + 2 – 2 ) = 5^2
    Bài 3:
    a) 541 + ( 218 – x ) = 735
    218 – x = 735 – 541
    218 – x = 194
    x = 218 – 194
    x = 24
    b) 5 × ( x + 35 ) = 515
    x + 35 = 515 : 5
    x + 35 = 103
    x = 103 – 35
    x = 68
    c) 96 – 3 × ( x + 1 ) = 42
    3 × ( x + 1 ) = 96 – 42
    3 × ( x + 1 ) = 54
    x + 1 = 54 : 3
    x + 1 = 18
    x = 18 – 1
    x = 17
    d) 12 × x – 33 = 3
    12 × x = 3 + 33
    12 × x = 36
    x = 36 : 12
    x = 3
    @ Sả gửi bạn ạ!

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