Question

Упрости выражение.
1) 5a-( -3a )+ ( - 4a) -8a
2)6a - ( -9) +8a + ( -9) -7a
3) -6xy + ( -5yx ) + 8xy - ( -2yx )

Answer 1

$1)5a-left(-3aright)+left(-4aright)-8a=5a+3a-4a-8a=-4a \ \ 2)6a-left(-9right)+8a+left(-9right)-7a=6a+9+8a-9-7a= \ =6a+8a-7a+9-9=7a+9-9=7a \ \ 3)-6xy+left(-5yxright)+8xy-left(-2yxright)=-6xy-5yx+8xy+2yx=-xy$

Answer 2

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