Question

8.6乘2.7加4.6乘4.3怎么巧算？

Answer 1

你好，8.6×2.7+4.6×3，一般想着能不能让加号这两边有个相同的数然后运用加法结合律进行运算，原式等于8.6×2.7+8.6×3÷2=8.6×(2.7+3÷2)=36.12。

Answer 2

你可以写成四点3×2，再乘以2.7，然后再加上四点6×4点三，这样就等于四点3×5点四，加上四点6×4点三，等于4.3乘以括号五点4+4点六，括号，等于四点3×10，等于43

Answer 3

因为4.6=2×2.3，所以4.6×4.3=2.3×2×4.3=2.3×8.6。则原式就等于8.6×2.7+8.6×2.3=8.6×（2.7+2.3）=43

Answer 4

8.6×2.7+4.6×4.3
＝4.3×2×2.7+4.6×4.3
＝4.3×5.4+4.6×4.3
=4.3×（5.4+4.6）
＝4.3×10
＝43

Answer 5

解:8.6×2.7+4.6×4.3
=4.3×5.4+4.6×4.3
=4.3×（5.4+4.6）
=4.3×10
=43