Question

(10000-9964-5×3)÷7×(10-45÷5÷3)<a<4×(5+5×5÷5÷5)=

Answer 1

(10000-9964-5×3):7×(10-45:5:3)<a<4×(5+5×5:5:5)

(36-5×3):7×(10-45:5:3)<a<4×(5+5×5:5:5)

(36-15):7×(10-45:5:3)<a<4×(5+5×5:5:5)

(36-15):7×(10-45:5:3)<a<4×(5+5×5:5:5)

21:7×(10-45:5:3)<a<4×(5+5×5:5:5)

21:7×(10-9:3)<a<4×(5+5×5:5:5)

21:7×(10-3)<a<4×(5+5×5:5:5)

21:7×7<a<4×(5+5×5:5:5)

3×7<a<4×(5+5×5:5:5)

21<a<4×(5+5×5:5:5)

21<a<4×(5+25:5:5)

21<a<4×(5+5:5)

21<a<4×(5+1)

21<a<4×6

21<a<24

a=21,22,23

( Prima oară când am scris < mă refeream la " mai mare sau egal " )

Answer 2

Răspuns:

a ∈ {21 ; 22 ; 23 }

Explicație pas cu pas:

(10000-9964-5×3)÷7×(10-45÷5÷3) ≤ a < 4×(5+5×5÷5÷5)

(36 - 15 ) :7 * (10 - 3) ≤ a < 4* (5+1)

21 :7 *7 ≤ a < 24

21≤ a < 24

a ∈ { 21 ; 22 ; 23 }