(3/5-19/25)*4 11/16-(1: 1,5)*(-4 3/8) - вопрос №596652135192541116115438 от Птичка56 27.05.2020 04:42

Question

Математика: (3/5-19/25)*4 11/16-(1: 1,5)*(-4 3/8)

Птичка56 · Answer

(3/5-19/25)*4 11/16-(1:1,5)*(-4 3/8)=2 1/6.

1)) 3/5- 19/25= (3•5)/(5•5)- 19/25= 15/25- 19/25= -4/25

2)) -4/25• 4 11/16= -4/25• (16•4+11)/16= -4/25• 75/16= -1/25• 75/4= -1/1• 3/4= -3/4;
Сократили (4 и 16 на 4; 75 и 25 на 25);
3)) 1:1,5= 1: 1 1/2= 1: (1•2+1)/2= 1/1: 3/2= 1/1• 2/3= 2/3;

4)) 2/3• (-4 3/8)= 2/3• (-4•8+3)/8= 2/3• (-35/8)= 1/3• (-35/4)= -35/12;
(Сократили 2 и 8 на 2);
5)) -3/4 - (-35/12)= -3/4+ 35/12= 35/12- 3/4= 35/12- (3•3)/(4•3)= 35/12- 9/12= 26/12= 2 2/12= 2 1/6;