初一5道计算题(1).(a^2+3)(a-2)-a(a^2-2a-2) (2).(2×10^3)·(8×10^6) (3).(2x+1)(x-3) (4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2 (5).(2a+3)(3/2b+5)
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![初一5道计算题(1).(a^2+3)(a-2)-a(a^2-2a-2) (2).(2×10^3)·(8×10^6) (3).(2x+1)(x-3) (4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2 (5).(2a+3)(3/2b+5)](/uploads/image/z/4346235-27-5.jpg?t=%E5%88%9D%E4%B8%805%E9%81%93%E8%AE%A1%E7%AE%97%E9%A2%98%281%29.%28a%5E2%2B3%29%28a-2%29-a%28a%5E2-2a-2%29+%282%29.%282%C3%9710%5E3%29%C2%B7%288%C3%9710%5E6%29+%283%29.%282x%2B1%29%28x-3%29+%284%29.2a%5E2b%C2%B7%28-1%2F2a%5E2b%5E3%2B5ab%5E2%29-3a%5E2b%C2%B7%28-2%2F3ab%29%C2%B75ab%5E2+%285%29.%282a%2B3%29%283%2F2b%2B5%29)
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初一5道计算题(1).(a^2+3)(a-2)-a(a^2-2a-2) (2).(2×10^3)·(8×10^6) (3).(2x+1)(x-3) (4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2 (5).(2a+3)(3/2b+5)
初一5道计算题
(1).(a^2+3)(a-2)-a(a^2-2a-2)
(2).(2×10^3)·(8×10^6)
(3).(2x+1)(x-3)
(4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2
(5).(2a+3)(3/2b+5)
初一5道计算题(1).(a^2+3)(a-2)-a(a^2-2a-2) (2).(2×10^3)·(8×10^6) (3).(2x+1)(x-3) (4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2 (5).(2a+3)(3/2b+5)
(1).(a^2+3)(a-2)-a(a^2-2a-2)
=a^3-2a^2+3a-6-a^3+2a^2+2a
=5a-6
(2).(2×10^3)·(8×10^6)
=2*8*10^9
=1.6*10^10
(3).(2x+1)(x-3)
=2x^2-6x+x-3
=2x^2-5x-3
(4).2a^2b·(-1/2a^2b^3+5ab^2)-3a^2b·(-2/3ab)·5ab^2
=-a^4b^4+10a^3b^3+10a^4b^4
=10a^3b^3+10a^4b^4
(5).(2a+3)(3/2b+5)
=3ab+10a+9/2b+15
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