Q98 of 196 Page 249

Simplify:

(25 ÷ 28) × 2–7

from the laws of exponents , we know that ,


am × an = a(m+n)


And , am ÷ an = a(m-n)


So ,we have , (25 ÷ 28) = 2(5-8)= 2-3


Now , 2-3 × 2–7= 2(-3)+(-7)= 2-10


∴ (25 ÷ 28) × 2–7= 2-10 = =


∴ (25 ÷ 28) × 2–7 =


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