Question

Bài 2: Tính bằng cách thuận tiện nhất:
a) 22,56 – 7,59 – 8,41    

b) 53,48 – 19,84 – 22,16

c) 14,23 + 7,06 – 1,23

d)20,06 – 12,37 – 7,63             

Answer 1

a)22,56 – 7,59 – 8,41

=22,56-(7,59+8,41)

=22,56-16

=6,56 

b) 53,48 – 19,84 – 22,16

=53,48-(19,84+22,16)

=53,48-42

=11.48

c) 14,23 + 7,06 – 1,23

=(14,23-1,23)+7,06

=13+7,06

=20.06

d)20,06 – 12,37 – 7,63

=20,06-(12.37-7,63)

=20,06-20

=0,06            

Answer 2

a,     \(22,56-7,59-8,41\\ =22,56-\left(7,59+8,41\right)\\ =22,56-16=6,56\)

b,       \(53,48-19,84-22,16\\ =53,48-\left(19,84+22,16\right)\\ =53,48-42=11,48\)

c,        \(14,23+7,06-1,23\\ =\left(14,23-1,23\right)+7,06\\ =15+7,06=22,06\)

d,         \(20,06-12,37-7,63\\ =20,06-\left(12,37+7,63\right)\\ =20,06-20=0,06\)