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简便计算：（309*17+375）/843.35*6.4*2+6.7*3.6
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简便计算：（309*17+375）/84 3.35*6.4*2+6.7*3.6
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答案和解析
(309×17+375)/84
= (3×103×17 + 3×125) / (3×28)
= (103×17 + 125) / 28
= (103×16 + 103 + 125) / 28
= (103×16 + 228) / (4×7)
= (103×4×4 + 57×4) / (4×7)
= (103×4 + 57 ) / 7
= (412 + 57 ) / 7
= (412 + 8 + 49 ) / 7
= (420 + 49 ) / 7
= 60 + 7
= 67
3.35×6.4×2 + 6.7×3.6
= 3.35×2×6.4 + 6.7×3.6
= 6.7×6.4 + 6.7×3.6
= 6.7×(6.4 + 3.6)
= 6.7×10
= 67
= (3×103×17 + 3×125) / (3×28)
= (103×17 + 125) / 28
= (103×16 + 103 + 125) / 28
= (103×16 + 228) / (4×7)
= (103×4×4 + 57×4) / (4×7)
= (103×4 + 57 ) / 7
= (412 + 57 ) / 7
= (412 + 8 + 49 ) / 7
= (420 + 49 ) / 7
= 60 + 7
= 67
3.35×6.4×2 + 6.7×3.6
= 3.35×2×6.4 + 6.7×3.6
= 6.7×6.4 + 6.7×3.6
= 6.7×(6.4 + 3.6)
= 6.7×10
= 67
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