1.7.816×1.45+3.14×2.186+1.69×7.816
= 7.816×1.45+1.69×7.816+3.14×2.186
=7.816×(1.45+1.69)+3.14×2.186
=7.816×3.14+3.14×2.186
=3.14×(7.816+2.186)
=3.14×(10+0.002)
=31.4+0.00628
=31.40628
2.那么多0可以先放一边,重点只要算111X18
=(100+10+1)X18算一下就行,再把零乘上,应该不难的吧
1.7.816×1.45+3.14×2.186+1.69×7.816
= 7.816×1.45+1.69×7.816+3.14×2.186
=7.816×(1.45+1.69)+3.14×2.186
=7.816×3.14+3.14×2.186
=3.14×(7.816+2.186)
=3.14×(10+0.002)
=31.4+0.00628
=31.40628
2.那么多0可以先放一边,重点只要算111X18
=(100+10+1)X18算一下就行,再把零乘上,应该不难的吧