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  【(1)1+2-3+4+5-6+7+8-9+10…+28+29-30(2)7777×9+1111×37(3)5123×35+7134×47+9145×59(4)(3.6×0.75×1.2)÷(1.5×24×0.18)(5)36×2.54+1.8×49.2(6)11×2+21×2×3+31×2×3×4+…+81×2×3×…×9.】

  (1)1+2-3+4+5-6+7+8-9+10…+28+29-30

  (2)7777×9+1111×37

  (3)5123×35+7134×47+9145×59

  (4)(3.6×0.75×1.2)÷(1.5×24×0.18)

  (5)36×2.54+1.8×49.2

  (6)11×2+21×2×3+31×2×3×4+…+81×2×3×…×9.

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2019-11-2121:28
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李虓

  (1)1+2-3+4+5-6+7+8-9+10…+28+29-30,

  =(1+2-3)+(4+5-6)+(7+8-9)…+(28+29-30),

  =0+3+6+…27,

  =(0+27)×10÷2,

  =270÷2,

  =135;

  (2)7777×9+1111×37,

  =1111×7×9+1111×37,

  =1111×(63+37),

  =1111×100,

  =111100;

  (3)5123×35+7134×47+9145×59

2019-11-21 21:33:24
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