Ответ:
Пошаговое объяснение:
1) 9/14-5/21=27/42-10/42=17/42
17/42:2 5/6=17/42*6/17=1/7
2) 240 -100%
180 - х%
х=(180*100):240=75%
3) = -3b-12-10+15b=12b-22
1.(9/14-5/21):2,5/6=(9/14•3)-(5/21•2):2,5/6•8=(27/42-10/42):2,40/42=1,10/40
2.(180:240)•100%=75%
3. -3(b+4)-5(2-3b)=-3b-12-10+15b=12b-22
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Ответ:
Пошаговое объяснение:
1) 9/14-5/21=27/42-10/42=17/42
17/42:2 5/6=17/42*6/17=1/7
2) 240 -100%
180 - х%
х=(180*100):240=75%
3) = -3b-12-10+15b=12b-22
1.(9/14-5/21):2,5/6=(9/14•3)-(5/21•2):2,5/6•8=(27/42-10/42):2,40/42=1,10/40
2.(180:240)•100%=75%
3. -3(b+4)-5(2-3b)=-3b-12-10+15b=12b-22