Question

Вычислите, используя законы умножения:
а) 48*5/17+48*12/17 б) 11/13*11/15+11/13*2/15 в) 12/19*23/15-12/19*4/15 г) 47/11*1/2-25/11*1/2 д) (47*1/26)*13/27-(20*1/26)*13/27 е) (1/2*3/4)*(2/3*4/5)*(5/6*7/8)*(6/7*8/9) ж) (2/3*4/5)*(3/4*5/6)*
(6/7*8/9)*(7/8*9/10)

Answer 1

А) =48(5/17+12/17)=48*17/17=48*1=48
б) = 11/13(11/15+2/15)=11/13*13/15=11/15
в) = 12/19(23/15-4/15)=12/19*19/15=12/15=4/5
г) = 1/2(47/11-25/11)=1/2*22/11=22/22=1
д) = 13/27(47/26-20/26)=13/27*27/26=13/26=1/2
е) = 1*2*3*4*5*6*7*8 / 2*3*4*5*6*7*8*9 = 1/9
ж) = 2*3*4*5*6*7*8*9 / 3*4*5*6*7*8*9*10 = 2/10 = 1/5