1)7*6=42 ; 7*3; =21 7*4=28
2)40+2=42; 20+1=21; 20+8=28
3)43-1=42; 25-4=21; 40-12=28
2,2+(-4*1/3)+(-1*13/15)= 11/5+4/3+(-13/15)= 11/5+4/3-13/15=8/3
(8/19 - 17/38) * 19/5 = -0.1
1)
8/19 - 17/38 = (8*38 - 17*19) / (19*38) = (304 - 323) / (19*38) = -19/(19*38) = -1/38
<span>2)
-1/38 * 19/5 = -(1*19) / (38*5) = -19/190 = -1/10</span>
1) 5(9-2m)+10m=45-10m+10m=45
2) 6(5a+3)-(7+a)-2(4-3a)=30а+18-7-а-8+6а=35а-3