Question

三道的脱式计算怎么写？

Answer 1

脱式计算是一个数学学科的术语，即递等式计算，把计算过程完整地写出来的运算，也就是脱离竖式的运算。1)24÷0.4÷0.6=24÷(0.4x0.6)=24÷0.24=100。2)19.8÷1.8x30.4=11x30.4=(10+1)ⅹ30.4=304+30.4.=334.4。3)21÷0.4x2.5=21÷2/5x5/2=21x5/2x5/2=(20+1)x25/4=20ⅹ25/4+1x25/4=125+6又1/4=131又1/4。

Answer 2

①24÷0.4÷0.6
=24÷2/5÷3/5
=24×5/2×5/3
=4×5×5
=100
②19.8÷1.8×30.4
=198/10×10/18×304/10
=11×1×304/10
=334.4
③21÷0.4×2.5
=21×10/4×25/10
=21×1/4×25
=131.25

Answer 3

25.2÷4.5+3.25×1.4
=5.6+4.55
=10.15.
2.54×99+2.24
=2.54×99+2.54-0.3
=2.54×(99+1)-0.3
=2.54×100-0.3
=254-0.3
=253.7.
(3/5)÷[(4/5-2/3)×9/14]
=(3/5)÷(2/15×9/14)
=(3/5)÷(3/35)
=7.