Объяснение:
3) 4bk-0,2b²-30k²+1,5bk-18bk+5,4k²-5b²+1,5bk=-13bk-5,2b²-24,6k²
4) xy-8/7x²-7/8y²+xy+xy-8/7y²-7/8x²+xy=4xy-113/64x²-113/64y²
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Объяснение:
3) 4bk-0,2b²-30k²+1,5bk-18bk+5,4k²-5b²+1,5bk=-13bk-5,2b²-24,6k²
4) xy-8/7x²-7/8y²+xy+xy-8/7y²-7/8x²+xy=4xy-113/64x²-113/64y²