Question

Ajutați-mă vă rog la ex:72 p142 matematica clasa 6 day coroană

Answer 1

72. a) (-3 1/3 - 2 2/3 ) * ( - 3 3/4) =
= (-10/3 - 8/3 ) * (-15/4) =
= (-6) *(-15/4) =
= 3*15/2 = 45/2 = 22 intregi 1/2

b) (5 3/8 - 7 5/27) : (-3 3/2) =
= (43/8 - 194/27):(-11/3) =
= ( -391/216):(-11/3) =
= 391/216 * 3/11 =
= 391/72*1/11 =
= 391/792

c) 1,8*2/8+1,8:2/9 =
= 9/5*2/9+9/5*9/2 =
= 1/5*2+81/10 =
= 2/5 + 81/10 = 17/2