8 17/39 -(7 1/2-4 22/39 ) = 8 17/39 - 7 1/2 + 4 22/39 = (<span>8 17/39 </span>+ <span>4 22/39) - 7 1/2 = 12 39/39 - 7 1/2 = 13 - 7 1/2 = 12 2/2 - 7 1/2 = 5 1/2</span>
25 7/32-21 1/24 = 25 21/96 - 21 4/96 = 4 17/96
9ц1/12-1ц3/16 =9ц4/48-1ц9/48 =8ц52/48-1ц9/48=7ц43/48
7ц2/7-4ц5/14 =7ц4/14-4ц5/14 =6ц18/14-4ц5/14 =2ц13/14
12ц11/18-5ц25/36 =12ц22/36-5ц25/36 =11ц58/36-5ц25/36 =6ц33/36
30ц37/44-24ц21/22 =30ц37/44-24ц42/44 =29ц81/44-24ц42/44 =5ц39/44
1)805см
2)19ц
3)?
4)109кг
5)5078г
6)1007мм
4х + 12 = 3х+8
переносим х в одну сторону, числа в другую
4х - 3х = 8 - 12
х = -4