简便计算1999*3.14+199.9*3.13+19.99*314谢谢

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简便计算1999*3.14+199.9*3.13+19.99*314谢谢
简便计算1999*3.14+199.9*3.13+19.99*314
谢谢

简便计算1999*3.14+199.9*3.13+19.99*314谢谢
1999*3.14+199.9*3.13+19.99*314=1999*3.14+1999*0.313+1999*0.0314=1999*(3.14+0.313+0.0314)=1999*3.4844=(2000-1)*3.4844=2000*3.4844-3.4844=69688-3.4844=69684.5156

1999*3.14+199.9*3.13+19.99*314
=1999*3.14+1999*3.13+1999*3.14
=1999*(3.14+3.13+3.14)
=1999*9.4
=(2000-1)*9.4
=18800-9.4
=18790.6

1999*3.14+199.9*31.4+19.99*314
=1999*3.14+1999*3.14+1999*3.14
=1999*3.14*3
=1999*3*3.14
=5997*3.14
=5000.3.14+900*3.14+90*3.14+7*3.14
=15700+2826+282.6+21.98
=18830.58