1) 1 3/5*3 1/3+(1-3/8)*(1-1/3) 2) 1 3/16*8-2 1/42*2 - вопрос №113531313811321316821422617112813136472619 от Диана10293 10.01.2020 22:45

Question

Математика: 1) 1 3/5*3 1/3+(1-3/8)*(1-1/3) 2) 1 3/16*8-2 1/42*2 6/17- 1 1/28*1 3/13

Диана10293 · Answer

1) 1 3/5*3 1/3+(1-3/8)*(1-1/3)=8/5*10/3+5/8*2/3=8/1*2/3+5/4*1/3=
=16/3+5/12=5 1/3+5/12=5 4/12+5/12=5 9/12=5 3/4=5,75

2) 1 3/16*8-2 1/42*2 6/17- 1 1/28*1 3/13=19/16*8-85/42*40/17- 29/28*16/13=
=19/2*1-85/42*40/17- 29/28*16/13=19/2-5/42*40/1-29/7*4/13=
=9 1/2-5/21*20-116/91=9 1/2-100/21-1 25/91=9 1/2-4 16/21-1 25/91=
=4 1/2-16/21-25/91=4 21/42-32/42-25/91=4-11/42-25/91=4-143/546-150/546=
=4-293/546=3 253/546