(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).
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(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).
(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).
(1)4(x+1/4)-(2x-1/2);(2)2a2-3(5a2-b2)+7(a2+2b2).
您好:
(1)4(x+1/4)-(2x-1/2)
=4x+1-2x+1/2
=2x+3/2
(2)2a2-3(5a2-b2)+7(a2+2b2)
=2a²-15a²+3b²+7a²+14b²
=-6a²+17b²
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