Toán Lớp 6: tính hợp lý: -392.(608 + 395) – 608.(395 + 392)
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Toán Lớp 6: tính hợp lý: -392.(608 + 395) – 608.(395 + 392)
Comments ( 2 )
=-392.608-392.395-608.395-608.392
=-392.(608+608)-395.(392+608)
=-392.1216-395.1000
=-476672-395000
=-871672
– 392 x ( 608 + 395 ) – 608 x ( 395 + 392)
= -392 x 608 – 395 – 608 x 395 – 608 x 392
= -392 x ( 608 + 608 )- 395 x ( 392 + 608 )
= – 392 x 1216 – 395 x 1000
= – 476672 – 395000
= – 871672