Question

Tính bằng cách thuận tiện nhất:17,8+28/100+81,2+72/100

Answer 1

17,8 + \(\dfrac{28}{100}\) + 81,2 + \(\dfrac{72}{100}\)

= (17,8 + 81,2) + (\(\dfrac{28}{100}+\dfrac{72}{100}\))

= 99 + \(\dfrac{100}{100}\)

= 99 + 1

= 100

Answer 2

\(17,8+\dfrac{28}{100}+81,2+\dfrac{72}{100}\\ =\left(17,8+81,2\right)+\left(\dfrac{28}{100}+\dfrac{72}{100}\right)\\ =99+\dfrac{100}{100}=99+1=100\)