1)26,16/6=4,36
2)2,6*1,4=3,64
3)4,36+3,64=8
4)8\0,4=20
5)20-0,4=19,6
Ответ:19,6
-1=7,2-2,4х; 2,4х=7,2+1; 2,4х=8,2; х=8,2/2,4; х=3 5/12;/////1=7,2-2,4х; 2,4х=7,2-1; 2,4х=6,2; х=6,2/2,4; х=2 7/12;////////-2/3=7,2-2,4х; 2,4х=7,2+2/3; 2,4х=7 1/5+2/3; 2,4х=7 13/15; х=7 13/15:2 2/5; х=118/15*5/12; х=3 5/18;///////5=7,2-2,4х; 2,4х=7,2-5; 2,4х=2,2; х=22/24; х=11/12.
17.5х=0.63
х=0,63/17,5
х=0,036
№1
а) 3/10*5/8=3/16
б) 5/6*3/11=5/22
№2
2/7*(5/8-3/16)=2/7*((10-3)/16)=2/7*7/16=2/16=1/8
№3
(2/9-1/7)*63=(14-9)/63*63=5/63*63=5
№ 5
3 5/8*2 1/3-2 1/3*5/8-7*5/8=29/8*7/3-7/3*5/8-7*5/8=7/3(29/8-5/8)-7*5/8=7/3*24/8-7*5/8=7-7*5/8=7(1-5/8)=7((8-5)/8)=7*3/8=21/8=2 5/8