Помогите срочно надо!!!


1. Выполните действия:
1) -3,4*2,7
2) -1 3/11 * (-2 2/21)
3) -12,72:(-0,4)
4) 15,45:(-15)


2. Упростите выражения:
1) -1,5а * (-6в)
2) -4m-15n+3m+18n
3) в+(7-в)-(14-в)
4) -2(х-3)+4(х+1)
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