(3х+у)-(-х-4у)=3х+у+х+4у=4х+5у
(х+6у)-(8х-7у)= х+6у-8х+7у=13у-7х
(m+n)-(m-n)=m+n-m+n=2n
(m+3)-(6m+5)-(m-1)= m+3-6m-5-m+1=-6m-1
(х-у)+(х-у)-(2х+у)= x-y+x-y-2x-y=-3y<span>
(0,2х-3)-(х-2)-(0,4х-1)=0.2x-3-x+2-0.4x+1=-1.2x</span>
№1:
а). 3/10 * 20/9 = 2/3
б). 36/7 * 2 = 72/7
в). 10/9 * 9/5 = 2
г). 8/7 : 16/7 = 8/7 * 7/16 = 1/2 = 0,5
д). 48/5 : 6 = 48/5 * 1/6 = 8/5 = 1,6
е). 8/3 : 16/9 = 8/3 * 9/16 = 3/2 =1,5
№2:
а). 10/3*6/5- 46/11:2=4 - 46/11 * 1/2 = 4 - 23/11 = 4 - 2 цел 1/11=1 цел10/11
б). 24/7 * 77/9 - 24/7 * 59/9 = 88/3 - 472/21 = 616/21 - 472/21 = 144/21 = 6цел 18/21
№3:
13/11*15/13*17/15*19/17*21/19*23/21 = 23/11
3195:15*24-(16*175+(175-157)*106)=404
1)175-157=18
2)16*175=2800
3)18*106=1908
4)2800+1908=4708
5)3195:15=213
6)213*24=5112
7)5112-4708=404