Răspuns :
a)-(2+9:10)x+5+13:2=(2+9/10)x x5+13:2=20+9/10x x5+13:2=29/10x x5+13:2=29/10x x5+13/2
d)1:2x(9:2x3:7x(5:3x1:2))x2:3=1:2x(9:2x3:7x(5:3:2))x2:31-2x(9:2x3:7x(5:3:2))x2:3=1/2x(9/2x3:7x(5:3:2))x2:3=1/2x(27/2:7x(5:3:2))x2:3=1/2x(27/2x1/7x(5:3:2))x2:3=1/2x(27/14x(5:3:2))x2:3=1/2x(27/14x(5/3:2))x2:3=1/2x(27/14x(5/3x1/2))x2:3=1/2x(27/14x5/6)x2:3=1-2x(9/14x5/2)x2:3=45/56x2:3=45/28x1:3=45/28:3=45/28x1/3=15/28x1=15/28
b)(2-2:3)x(5:2-1:4)+2:7:2:7=(2-2/3)x(5:2-1:4)+2:7:2:7=6-2/3x(5:2-1:4)+2:7:7=4/3x(5:2-1:4)+2:7:2:7=4/3x(5/2-1:4)+2:7:2:7=4/3x(5/2-1/4)+2:7:7:2:7=4/3x10-1/4+2:7:2:7=4/3x9/4+2:7:2:7=1/3x9+2:7:2:7=1x3+2:7:2:7=3+2:7:2:7=3+2/7:2:7=3+2/7x1/2:7=3+1-7x1:7=3+1/7:7=3+1/7x1/7=3+1/49=147+1/49=148/
Sper sa-ti fie de folos
d)1:2x(9:2x3:7x(5:3x1:2))x2:3=1:2x(9:2x3:7x(5:3:2))x2:31-2x(9:2x3:7x(5:3:2))x2:3=1/2x(9/2x3:7x(5:3:2))x2:3=1/2x(27/2:7x(5:3:2))x2:3=1/2x(27/2x1/7x(5:3:2))x2:3=1/2x(27/14x(5:3:2))x2:3=1/2x(27/14x(5/3:2))x2:3=1/2x(27/14x(5/3x1/2))x2:3=1/2x(27/14x5/6)x2:3=1-2x(9/14x5/2)x2:3=45/56x2:3=45/28x1:3=45/28:3=45/28x1/3=15/28x1=15/28
b)(2-2:3)x(5:2-1:4)+2:7:2:7=(2-2/3)x(5:2-1:4)+2:7:2:7=6-2/3x(5:2-1:4)+2:7:7=4/3x(5:2-1:4)+2:7:2:7=4/3x(5/2-1:4)+2:7:2:7=4/3x(5/2-1/4)+2:7:7:2:7=4/3x10-1/4+2:7:2:7=4/3x9/4+2:7:2:7=1/3x9+2:7:2:7=1x3+2:7:2:7=3+2:7:2:7=3+2/7:2:7=3+2/7x1/2:7=3+1-7x1:7=3+1/7:7=3+1/7x1/7=3+1/49=147+1/49=148/
Sper sa-ti fie de folos
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