作业帮4.7乘以2.8+3.6乘以9.4怎样简便运算?
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4.7乘以2.8+3.6乘以9.4怎样简便运算?
4.7乘以2.8+3.6乘以9.4怎样简便运算?
4.7乘以2.8+3.6乘以9.4怎样简便运算?
4.7 × 2.8 + 3.6 × 9.4
= 4.7 × 2.8 + 7.2 × 4.7
= 4.7 × (2.8 + 7.2)
= 4.7 × 10
= 47
4.7乘以2.8+3.6乘以9.4
=9.4*(1.4+3.6)
=9.4*5
=47
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