Помогите! Раскройте скобки и упростите выражение:
1)(5.3+a)-(a+6.4)
2)-(9.4-b)+(-b+3.7)
3)-(x-5.8-y)-(11.3-x)
4)-(a-b-7.4)+(-7.4+a+b)
1)(5.3+a)-(a+6.4)
2)-(9.4-b)+(-b+3.7)
3)-(x-5.8-y)-(11.3-x)
4)-(a-b-7.4)+(-7.4+a+b)
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Answers & Comments
2)-36+b-b+21=-15
3)-x+40+y-33+x=7+y
4)-a+b+28=28+a+b=-a-a+b-b+28-28=