3.3×2.78×0.2-3.3×0.2×0.2 2.4×2.5×0 2
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2018-07-09
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(1)原式=(7 8 )6÷(-7 8 )5+1-4×1 2 =-7 8 +1-2 =-17 8 ; (2)原式=9x3y2÷(-3xy)-6x2y÷(-3xy)+3xy÷(-3xy) =-3x2y+2x-1; (3)原式=x2-(2y-3)2 =x2-4y2+12y-9; (4)原式=1+[(-0.25×(-4)]2012×(-4)+5002-(500-2)×(500+2) =1+(-4)+5002-5002+4 =1.
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