Question

Tính nhẩm

a.25.34

b.1600:25

c.84:17

d.1454-97

Answer 1

a)25.34=850

b)1600:25=64

c)84:17=14(dư16)

d)1454-97=1357

Answer 2

a, 25.34 = (20 + 5 ) .34 = 20.34 + 5 .34 =680 + 170 = 850

b, 1600 : 25 = ( 1600 . 4 ) : ( 25 .4 ) = 6400 : 100 = 64

c, 84 : 17 = 4 dư 16

d, 1454-97 = ( 1454 + 3 ) - ( 97 + 3 ) =1457 - 100 = 1357