21x[3x(18-15)+7x(33-34)] : 2 : 3-7 +5x3 : (2+15x5) =x to mnożenie ! prosze pilneee !
21·[3·(18-15)+7(33-34)]:2:3-7+5·3:(2+15·5)=
= 21·[3·3+7·(-1)]:2:3-7+15:(2+75)=
= 21·[9-7]:2:3-7 + 15:77=
= 21·2:2:3-7+ 15/77 = 21:3-7 + 15/77 = 7-7 + 15/77 = 15/77
15/77
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21·[3·(18-15)+7(33-34)]:2:3-7+5·3:(2+15·5)=
= 21·[3·3+7·(-1)]:2:3-7+15:(2+75)=
= 21·[9-7]:2:3-7 + 15:77=
= 21·2:2:3-7+ 15/77 = 21:3-7 + 15/77 = 7-7 + 15/77 = 15/77
15/77