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列式计算.(1) 4 5 与 1 4 ...

(1/4+1/4×99)÷(1/5) =1/4x(1+99)x5 =1/4x100x5 =25x5 =125 , 你好,本题已解答,如果满意 请点右下角“采纳答案”。

列竖式计算 1/4+1/3+1/4+1/3 =(1/4+1/4)+(1/3+1/3) =1/2+2/3 =3/6+4/6 =7/6 =1又1/6

如图

5/4X1/3=5/12, 5/4-5/12=15/12-5/12=10/12(吨),

(60x1/4十5)除以20% =(15十5)除以0.2 =20除以0.2 =100

(1)(8-5)÷5 =3÷5=60%; (2)24× 2 1 3 × 1 1 4 =56× 5 4 =70;(3)24× 1 24 - 1 2 × 2 3 =1 - 1 3 = 2 3 ;(4) 4 2 3 ÷3 1 9 = 14 3 × 9 28 =150%;(5) 3 3 5 ÷(1 + 3 5 )= 18 5 × 5 8 = 9 4 (吨).

(1)24÷3/5x1/5 =24*5/3*1/5 =40*1/5=8 (2)(30+8x1/4)÷8/9=(30+2)*9/8=32*9/8=36

1/5

(1)235×7=1645(2)649×5=3245(3)580×9=5220(4)407×5=2035

(1)设这个数为x,x×72=145,x×72÷72=145÷72, x=45;45×14=15.(2)设这个数为x,75%x+75×4=456, 0.75x+300=456,0.75x+300-300=456-300, 0.75x=156,0.75x÷0.75=156÷0.75, x=208.

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