16*30=480 9*45=405 405+480=885 1000-885=115 ответ сдача 115 рубл
1) 2089024 , 2 ) 3998108, 5400090,4111000,5705600,6019000,5300000,4420080,2105206,4100065
3 2/5:17/20=4
4 1/2-4=1/2
11/15*1/2=11/30
11/30+1 11/20=1 11/12
1/2-0.5=1/2-5/10=1/2-1/2=0
3/4-0.125=3/4-125/1000=3/4-1/8=6/8-1/8=5/8
7/36+0.25=7/36+25/100=7/36+1/4=7/36+9/36=16/36=4/9
1/100+0.7=1/100+7/10=1/100+70/100=71/100