Question

Tính bằng cách thuận tiện "

a) 98 x 376,9 + 376,9 x 2 - 376,9 + 376,9 =

b)60 - 26,75 - 13,25 =

c) 38,25 - 18, 25 + 21,64 - 11,64 + 9, 93 =

d) 45,28 + 52,17-15,28 - 12,17 =

Answer 1

a)

\( 98 . 376,9 + 376,9 . 2 - 376,9 + 376,9 \)

\(=376,9.(98+2-1+1)\)

\(=367,9.100 \)

\(=36790\)

b)

\(60-26,75-13,25 \)

\(= 60 - (26,75+13,25) \)

\(=60-40\)

\(= 20\)

c)

\(38,25 - 18,25 + 21,64 - 11,64 + 9,93 \)

\(= (38,25 - 18,25) + ( 21,64 - 11,64) + 9,93 \)

\(= 20 + 10 + 9,93 \)

\(= 30 + 9,93 \)

\(= 39,93\)

d)

\(45,28 + 52,17 - 15,28 - 12,17 \)

\(= (45,28 - 15,28) + (52,17 - 12,17) \)

\(= 30 + 40 \)

\(= 70\)