Question

Tính bằng cách thuận tiện nhất:

a)     1,25 + 1,25 x 2 + 7 x 1,25

b)     3,62 x 12 – 2 x 0,362 x 10

c)      12,35 x 15 – 1,235 x 10 x 6 + 12,35    

d)     1,42 : 0,5 + 1,42 x 8

Answer 1

a)`1,25 + 1,25 xx 2 + 7 xx 1,25=1,25 xx (1+2+7) = 1,25 xx 10 =12,5`

b)`3,62xx12–2xx0,362xx10=3,62 xx 12 -2 xx 3,62=3,62xx(12-2)=3,62xx10=36,2`

c)`12,35xx15–1,235xx10xx6+12,35=12,35xx15–12,35xx6+12,35=12,35xx(15-6+1)=12,35xx10=123,5`    

d)`1,42 : 0,5 + 1,42 xx 8=1,42xx2+1,42xx8=1,42xx(2+8)=1,42xx10=14,2`

Answer 2