(1):(2X-Y-3)^2 (2):59.8*60.2 (3)198^2 (4):4(X+1)^2-(2x+5)(2X-5)第1,2,3,4题要整式计算
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![(1):(2X-Y-3)^2 (2):59.8*60.2 (3)198^2 (4):4(X+1)^2-(2x+5)(2X-5)第1,2,3,4题要整式计算](/uploads/image/z/1590050-2-0.jpg?t=%281%29%3A%282X-Y-3%29%5E2+%282%29%3A59.8%2A60.2+%283%EF%BC%89198%5E2+%EF%BC%884%EF%BC%89%EF%BC%9A4%28X%2B1%29%5E2-%EF%BC%882x%2B5%EF%BC%89%EF%BC%882X-5%EF%BC%89%E7%AC%AC1%2C2%2C3%2C4%E9%A2%98%E8%A6%81%E6%95%B4%E5%BC%8F%E8%AE%A1%E7%AE%97)
(1):(2X-Y-3)^2 (2):59.8*60.2 (3)198^2 (4):4(X+1)^2-(2x+5)(2X-5)第1,2,3,4题要整式计算
(1):(2X-Y-3)^2 (2):59.8*60.2 (3)198^2 (4):4(X+1)^2-(2x+5)(2X-5)
第1,2,3,4题要整式计算
(1):(2X-Y-3)^2 (2):59.8*60.2 (3)198^2 (4):4(X+1)^2-(2x+5)(2X-5)第1,2,3,4题要整式计算
1.原式=(2x-y)²-2(2x-y)×3+9
= 4x²-4xy+y²-12x+6y+9
= 4x²+y²-4xy-12x+6y+9
2.原式=59.8×60.2
=3599.96
3.原式=198²
=39204
4.原式=4×(x²+2x+1)-(4x²-25)
=4x²+8x+4-4x²+25
=8x+29
1.原式=(2x-y)²-2(2x-y)×3+9
= 4x²-4xy+y²-12x+6y+9
= 4x²+y²-4xy-12x+6y+9
2.原式=59.8×60.2
=3599.96
3.原式=198&su...
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1.原式=(2x-y)²-2(2x-y)×3+9
= 4x²-4xy+y²-12x+6y+9
= 4x²+y²-4xy-12x+6y+9
2.原式=59.8×60.2
=3599.96
3.原式=198²
=39204
4.原式=4×(x²+2x+1)-(4x²-25)
=4x²+8x+4-4x²+25
=8x+29
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