数学计算题,(要过程)

日期:2015-09-26 15:37:58 人气:1

数学计算题,(要过程)

(1/4-1/12)×(-48) =-1/4×48+1/12×48 =-12+4 =-8 (4/7-1/9+2/21)×63 =4/7×63-1/9×63+2/21×63 =36-7+6 =35 265×(-1.25)-12.5×13.5+0.125×3980 =265×(-1.25)-1.25×135+1.25×398 =(-265-135+398)×1.25 =-2×1.25 =-2.5
    A+
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