1) 3(a-b)-2(a+b)=3a-3b-2a-2b=a-b
2) <span>4(x+y)+5(2x-y)=4x+4y+10x-5y=14x-y
3) </span><span>2.4(c-3d)-1.3(2c-d)=2.4c-7.2d-2.6c+1.3d=-0.2c-5.9d
4) </span><span>-3/4(1/3m+n)-1/4(3m+n)=-1/4m-3/4n-3/4m-1/4n=-m-n</span>
1) <span>3 2/7 = 23/7
5 7/11 = 62/11
2 11/36 = 83/36
2) </span><span>4 1/3 - 4/3
5 7/15 - 22/15
3 8/45 = 53/45
3) 5 = 40/8
12 = 96/8
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1)6,4+73,5*2=2,11 1)73,5*2=147 2)147+6,4=2,11 3)25,2*3+36,5*2= 5338,8 1) 25,2*3=75,6 2)36,5*2=73 3)75,6+73=5338,8