Bài 1(2đ): a) 25 2 1 :    − 5 3    − 37 1 2 :    − 5 3   : 3   −37 1 −25 1= 253= (-12): = 20 (1đ)b) 34 15 + 3 1 + 19 34 + 3 2 + 1 17 15=    34 15 + 19 34    +    + 1 3 3 2    + 1 17 15 = 34 34 + 3 3 + 1 17 15 = 3 17 15 (1đ)

   − 5 3    − 37 1 2

Toán DE THI TOAN KI I LP 7 CÓ DAP AN

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Bài 1(2đ):

a) ²⁵ ₂ ¹ ^: ^ _ ^{ −} ₅ ³ ^ _ ^ ⁻ ³⁷ ¹ ₂ ^: ^ _ ^{ −} ₅ ³ ^ _ ^

: 3

 

  −

37 1

 −

25 1

= ^

2

5 



3 = (-12): ^

= 20 (1đ)

b) ₃₄ ¹⁵ ⁺ ₃ ¹ ⁺ ¹⁹ ₃₄ ⁺ ₃ ² ⁺ ¹ ₁₇ ¹⁵

= ^ _ ^ ₃₄ ¹⁵ ⁺ ¹⁹ ₃₄ ^ _ ^ ⁺ ^ _ ^{ +} ¹ ₃ ₃ ² ^ _ ^ ⁺ ¹ ₁₇ ¹⁵

= ₃₄ ³⁴ ⁺ ₃ ³ ⁺ ¹ ₁₇ ¹⁵ ⁼ ³ ₁₇ ¹⁵ (1đ)

   − 5 3    − 37 1 2

Bài 1(2đ):

a) 25 2 1 :    − 5 3    − 37 1 2 :    − 5 3   

: 3

 

  −

37 1

 −

25 1

= 

2

5





3

= (-12): 

= 20 (1đ)

b) 34 15 + 3 1 + 19 34 + 3 2 + 1 17 15

=    34 15 + 19 34    +    + 1 3 3 2    + 1 17 15

= 34 34 + 3 3 + 1 17 15 = 3 17 15 (1đ)

Bạn đang xem bài 1 - DE THI TOAN KI I LP 7 CÓ DAP AN

a) ²⁵ ₂ ¹ ^: ^ _ ^{ −} ₅ ³ ^ _ ^ ⁻ ³⁷ ¹ ₂ ^: ^ _ ^{ −} ₅ ³ ^ _ ^

= ^

= (-12): ^

b) ₃₄ ¹⁵ ⁺ ₃ ¹ ⁺ ¹⁹ ₃₄ ⁺ ₃ ² ⁺ ¹ ₁₇ ¹⁵

= ^ _ ^ ₃₄ ¹⁵ ⁺ ¹⁹ ₃₄ ^ _ ^ ⁺ ^ _ ^{ +} ¹ ₃ ₃ ² ^ _ ^ ⁺ ¹ ₁₇ ¹⁵

= ₃₄ ³⁴ ⁺ ₃ ³ ⁺ ¹ ₁₇ ¹⁵ ⁼ ³ ₁₇ ¹⁵ (1đ)