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Tính hợp lí: a, 5.(-3)^2-14.(-8)+(-31) b,6.(-2)^3+5.(-4)-(-12) c,-31-[82-(-17)] d,8.25.(-125).4.12.(-2020)^0:(-3) e,-128.[(-25)+89]+128(89-125) f,-567-(-113)+(-69)-(113-567) g,15.(17-111)-17.(222+15)
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