1/9 от 45 = 5 1/7 от 84 =12
3) 99999-(999*100)=99999-99900=99 4) (89999+10001)*99=100000*99=9900000 5) 10000-(1026-679)=10000-347=9653 6) 1 000 000-(98 765*8)=1000000-790120 =209880
4х+2*(40-х)=100
4х+80-2х=100
4х-2х=100-80
2х=20
х=20/2
х=10
2х+4*(40-х)=100
2х+160-4х=100
2х-4х=100-160
-2х=-60
х=-60/-2
х=30
42/98=21/49=3/7
75/90=15/18=5/6
45/75=9/15=3/5
27/63=9/21=3/7
81/90=9/10
51/85=3/5