Ответ: -1/4.
Объяснение:
3/4+5 1/4 * (7/15-10/21) - 19/20 =-1/4.
1) 7/15-10/21= 49/105-50/105=-1/105;
2) 5 1/4*(-1/105)= -21/4*1/105=-1/20;
3) 3/4+(-1/20)=15/20-1/20=14/20=0,7;
4) 14/20-19/20=-5/20=-1/4.
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Answers & Comments
Ответ: -1/4.
Объяснение:
3/4+5 1/4 * (7/15-10/21) - 19/20 =-1/4.
1) 7/15-10/21= 49/105-50/105=-1/105;
2) 5 1/4*(-1/105)= -21/4*1/105=-1/20;
3) 3/4+(-1/20)=15/20-1/20=14/20=0,7;
4) 14/20-19/20=-5/20=-1/4.