求12.5x0.25x0.05x3.7x6.4的巧演算法

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求12.5x0.25x0.05x3.7x6.4的巧演算法

12.5x0.25x0.05x3.7x6.4
=12.5x0.25x0.05x3.7x8x2x0.4
=(12.5x8)x(0.25 x 0.4)x(0.05x2)x3.7
=100x0.1x0.1x3.7
=3.7
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1.25x3.7x6.4x0.5÷3.7的簡便算式是

解：1.25x3.7x6.4x0.5÷3.7
=1.25x(6.4x0.5)x(3.7÷3.7)(
=1.25x3.2x1
=1.25x(3+0.2)
=3.75+0.25
=4

2．6X3．7十0．26X62十0．26巧算

=2.6×3.7+2.6×6.2+2.6×0.1
=2.6×（3.7+6.2+0.1）
=2.6×10
=26

23x39+23x61巧演算法怎麼算

23x39+23x61
=（39+61）*23
=100*23
=2300

3.7x59+37x6.4-3.7x23用簡便 ... 怎麼算

3.7x59+37x6.4-3.7x23
=3.7×（59+64-23）
=3.7×（59+41）
=3.7×100
=370

0.25x3.7x0.4減算

0.37

217x34 217x66巧算怎麼算

217x34+217x66
=217x（34+66）
=217x100
=21700

617x68+742x32能否巧算

617x68+742x32
=617x68+(617+125)x32
=617x(68+32)+125x8x4
=617x100+1000x4
=61700+4000
=65700

17x47+47x19+19x6+6x34怎麼巧算

17×47+47×19+19×6+6×34
=（17×47+6×34）+（47×19+19×6）
=（17×47+12×17）+19×（47+6）
=17×（47+12）+19×53
=17×59+19×53
=1003+1007
=2010