Question

0.49➗3.5+1.26✖️0.45简便方法？

Answer 1

根据题意有:
0.49÷3.5+1.26×0.45
＝0.49÷(7/2)+1.26×0.45
＝0.49×(2/7)+1.26×0.45
＝0.07×2+1.26×0.45
＝0.14+(1.4-0.14)×0.45
＝0.14+1.4×0.45-0.14×0.45
＝0.14×(1-0.45)+1.4×0.45
＝0.14×0.55+0.14×4.5
＝0.14×(0.55+4.5)
＝0.14×5.05
＝0.14×(5+0.05)
＝0.14×5+0.14×0.05
＝0.9+0.009
＝0.909

Answer 2

0.49和3.5先同时除7就是0.07除以0.5就是0.07乘以2；1.26除2而0.45乘2保持等式不变，就是0.63乘以0.9；结果就是0.14加0.567等于0.707。个人解法，非喜勿喷。

Answer 3

0.49÷3.5=0.07ⅹ7/0.5ⅹ7=0.07/0.5=0.14
1.26ⅹ0.45=1.26ⅹ0.9/2=1.26/2ⅹ0.9
=0.63ⅹ0.9=0.567
所以0.49÷3.5+1.26x0.45
=0.14+0.567=0.707

Answer 4

0.49÷3.5+1.26×0.45
=0.14+0.567
=0.707

你好，本题已解答
如满意，请点采纳

Answer 5

可以这样变化一下
0.49÷7÷0.5+1.26×（0.5-0.05）
＝0.07÷0.5+0.63-0.063
＝0.035+0.63-0.063＝0.602
这样就简便多了！