Question

用简便方法计算7.28晨0.1加0.5乘72.8，加0.049城728？

Answer 1

用简便方法计算7.28晨0.1加0.5乘72.8，加0.049城728？

7.28*0.1+0.5*72.8+0.049*728
=72.8*0.01+0.5*72.8+0.49*72.8
=72.8*（0.01+0.5+0.49）
=72.8*1
=72.8

Answer 2

7.28×0.1+0.5×72.8+0.049×728。因为72.8×0.5＝7.28×5，0.049×728＝7.28×4.9。所以原式等于7.28×（0.1+5+4.9）＝7.28×10＝72.8

Answer 3

解：依题意得
7.28×0.1+0.5×72.8+0.049×728
=7.28×0.1+5×7.28+4.9×7.28
=7.28×（0.1+5+4.9）
=7.28×10
=72.8

Answer 4

题目化成数学式:
7.28×0.1+0.5×72.8+0.049×728
=7.28×0.1+0.5×10×7.28+0.049×100×7.28
=7.28×0.1+5×7.28+4.9×7.28
提取7.28，以上题目化为:
7.28×(0.1+5+4.9)
=7.28×10
=72.8
最终答案为72.8

Answer 5

简便计算
7.28x0.1+0.5x72.8+0.049x728
=7.28x0.1+5x7.28+4.9x7.28
=7.28x（0.1+5+4.9）
=7.28x10
=72.8