小学奥数题 简便计算(6.4×7.5×8.1)÷(3.2×2.5×2.7)

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小学奥数题 简便计算(6.4×7.5×8.1)÷(3.2×2.5×2.7)
小学奥数题 简便计算
(6.4×7.5×8.1)÷(3.2×2.5×2.7)

小学奥数题 简便计算(6.4×7.5×8.1)÷(3.2×2.5×2.7)
(6.4×7.5×8.1)÷(3.2×2.5×2.7)
=(6.4÷3.2)×(7.5÷2.5)×(8.1÷2.7)
=2×3×3
=18

=2*3*3=18

18

6.4×7.5×8.1
=-------------
3.2×2.5×2.7
2×3×3
=-------(约分)
1×1×1
18
=----
1
=18

原式=(0.8×8 ×2.5×5 ×0.9×9)÷(0.4×8 ×0.5×5 ×0.3×9)
=0.8×8 ×2.5×5 ×0.9×9÷0.4÷8 ÷0.5÷5 ÷0.3÷9
=0.8÷0.4 ×8÷8 ×1.5÷0.5 ×9÷9 ×0.9÷0.3 ×5÷5
=2×1×3×1×3×1
=2×9
=18

(6.4×7.5×8.1)/(3.2×2.5×2.7)
=2*3*3
=18

=(6.4×7.5×8.1)÷(4×0.8×2.5×2.7)
=(6.4×7.5×8.1)÷(4×2.5×0.8×2.7)
=(6.4×7.5×8.1)÷(8×2.7)
=(8×0.8×7.5×2.7×3)÷(8×2.7)
=0.8×7.5×3
=0.8×2.5×3×3
=2×9
=18