Oblicz :
a ) (6,5 - 4,7) : (4 - 2 1/5)
b ) (1,5 - 1 1/3 ) x 2 2/5 - 0,1
c ) (6,25 - 2 1/2 ) : 2 1/7 - 1
Ps : Prosze o całe działania ( obliczenia ) a nie tylko wyniki .
Ps2 : np. w A) to jest dwie i jedna piata , tak samo jak w B i C a X to znak mnożenia ; )
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a)(6,5 - 4,7):(4-2 1/5) = 1,8:(4-2,2)=1,8:2,2=1 8/10 : 2 2/10 = 18/10x10/22 = 18/22 = 9/11
b)(1,5 - 1 1/3)x2 2/5 - 0,1 = ( 1 1/2 - 1 1/3)x2,4-0,1=(1 3/6 - 1 2/6 )x2,4-01 = 1 1/6 x 2 4/10 - 1/10 = 7/6 x 24/10 - 1/10 = 28/10 - 1/10 = 27/10 = 2,7
c) (6,25 - 2 1/2):2 1/7 - 1 = (6,25 - 2,5):2 1/7 - 1 = 3,75: 2 1/7 - 1 = 3 3/4 : 2 1/7 - 1 = 15/4 x 7/15 - 1 = 7/4 - 1 = 1 3/4 - 1 = 3/4