1)(5 8/9: 1 17/36+1 1/4 ) * 5/21=? 3/8-2 5/12): 5 - вопрос №41304981589117361145213825125512 от aliskylivar 24.05.2020 08:50

Question

Математика: 1)(5 8/9: 1 17/36+1 1/4 ) * 5/21=? 3/8-2 5/12): 5 5/12=? решите по действиям)

aliskylivar · Answer

1) ((5*9*4+8*4)/(9*4): (36+17)/36+(1*4*9+1*9)/36)*)5/21=
(212/36:53/36+45/36)*5/21=(212/53+5/4)*5/21=(4+5/4)*5/21=20/21+(5*5)/(4*21)=(20*4+5*5)/(4*21)=(80+25)/84=105/84=1, 25 или 1 цел и 1/4

2) {-(1*3*8+3*3)/24 - (2*2*12+5*2)/24)}:(5*12*2+5*2)/24=( -33/24-58/24 ) : (130/24)= (- 91/24):(130/24)= -91/130 = -0,7