Question

8.1×1.9＋0.9×1.9＋1.9和0.1＋1.9×3.2的简便法

Answer 1

8.1×1.9＋0.9×1.9＋1.9
=(8.1+0.9+1)x1.9
=10x1.9
=19

0.1＋1.9×3.2
=0.1+2x3.2-0.1x3.2
=0.1+6.4-0.32
=6.5-0.32
=6.18

Answer 2

8.1×1.9＋0.9×1.9＋1.9
=1.9(8.1+0.9+1)
=1.9*10
=19
0.1+1.9*3.2
=0.1+(2-0.1)*3.2
=0.1+2*3.2-0.1*3.2
=0.1(1-3.2)+2*3.2
=0.1*(-2.2)+2*3.2
=-0.22+2*3.2
=-0.22+6.4
=6.18

Answer 3

1.9（8.1+0.9+1）=19
后面那个我真是不知道怎么简便 感觉怎么算都很麻烦
感觉你题目0.1前面抄漏了3.2X
3.2（0.1+1.9）=6.4

Answer 4

=(8.1+0.9+1)x1.9=19
=0.1+(2-0.1)x3.2
=0.1+6.4-0.32
=6.18

Answer 5

＝（8.1+0.9）×1.9
＝9×1.9
＝17.1

Answer 6

（8.1+0.9+1）*1.9
=10*1.9
=19

追问

2个

追答

0.1+（2-0.1）*3.2