(5.1+4)×5.2怎么简算？
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=(5+0.1+4)x5.2
= (5+4+0.1)x5.2
= (9+0.1)x5.2
= 9x5.2 +0.1x5.2
= (10-1)x5.2 + 0.52
= 10x5.2 - 1x5.2 +0.52
= 52 - 5 - 0.2 +0.52
= (52-5) +(0.52-0.2)
= 47 + 0.32
= 47.32
= (5+4+0.1)x5.2
= (9+0.1)x5.2
= 9x5.2 +0.1x5.2
= (10-1)x5.2 + 0.52
= 10x5.2 - 1x5.2 +0.52
= 52 - 5 - 0.2 +0.52
= (52-5) +(0.52-0.2)
= 47 + 0.32
= 47.32
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