兀是如何算出来的 3.14×90+31.4用简便方法怎么算

3.14×90+31.4用简便方法怎么算  

3.14×90+31.4用简便方法怎么算

用简便方法计算
3.14×90+31.4
=31.4x(9+1)
=31.4x10
=314

3.14×85×1.5×31.4用简便方法算

3.14×85+1.5×31.4
=3.14x（85+1.5x10)
=3.14x(85+15)
=3.14x100
=314
谢谢，请采纳

3.14*0.68+31.4*0.032怎么用简便方法计算

3.14*0.68+31.4*0.032 = 3.14*0.68+3.14*0.32 = 3.14*(0.68+0.32) = 3.14

3.14×5.5-0.45×31.4的简便方法怎样算?

3.14×5.5-0.45×31.4
=3.14x5.5-4.5x3.14
=3.14x(5.5-4.5)
=3.14x1
=3.14

用简便方法计算1999*3.14+1999*31.4-1999*314-999*3.14

1999*3.14+1999*31.4-1999*314-999*3.14=
1999*3.14+1999*31.4-1999*314-999*3.14
-1000*3.14+1000*3.14=1999*3.14+1999*31.4-1999*314-1999*3.14+1000*3.14
=3140

3.14*1.9+31.4*0.81d的简便方法计算

3.14*1.9+31.4*0.81
=31.4*0.19+31.4*0.81
=31.4*（0.19+0.81）
=31.4

3.14X75+31.4X3.5-3.14用简便方法

3.14X75+31.4X3.5-3.14用简便方法
=3.14x(75+35-1)
=3.14x109
=3.14x(100+10-1)
=314+31.4-1
=344.4

3.14×(-4.13)-(-1.1)×31.4-3.14×5.87 用简便演算法怎么做?

3.14×(-4.13)
-
(-1.1)×31.4
-
3.14×5.87
=
3.14×(-4.13)
-
3.14×(-11)
-
3.14×5.87
=
3.14 × (-4.13 + 11 - 5.87)
=
3.14 × 1
=
3.14

3.14乘以0.68加上31.4乘以0.032用简便方法算

3.14乘以0.68加上31.4乘以0.032
=3.14×（0.68+0.32）
=3.14×1
=3.14

0.246÷0.06×3.14用简便方法怎么算

0.246÷0.06×3.14用简便方法怎么算
0.246÷0.06×3.14
=4.1*3.14
=
12.874
直接计算