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-14×3/4-5×3/8 1/4×(-14)一5/8×5

3/8+5/40+4/5 15/40+5/40+32/40 52/40 13/10

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4/3—(2/5+3/1O丿=4O/3O一{I2/30+9/3o)=4o/30_21/3o=丨9/30先通分再计算

1/4+1又2/5+3/4+8/5 =(1/4+3/4)+(1又2/5+8/5) =1+3 =4

解: 3/8-(3/4×1/10-5/8) =3/8-3/40+5/8 =(3/8+5/8)-3/40 =1-3/40 =37/40 2.875÷(1/4+9/4×1/3) =2.875÷(1/4+3/4) =2.875÷1 =2.875

40×(3/4+1/2-5/8) =40×3/4+40×1/2-40×5/8 =30+20-25 =25

15×5+8-4÷3/1 =75+8-4/3 =83-4/3 =245/3

如图

一加二的零次方等于二,二加二的一次方等于六,就是找二的n次方的规律,42之后是42加上二的五次方,所以填74

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