Question

2a-3b-4c=4求4的a次方除以8的b次方乘以1/16的c次方-4的值要有过程必须要看的懂

Answer 1

4的a次方除以8的b次方乘以1/16的c次方-4
=2的2a次方除以2的3b次方除以2的4c次方-4
=2的(2a-3b-4c)次方-4
=2的4次方-4
=16-4
=12

Answer 2

楼上 计算 很完美

Answer 3

Now for the baby to buy clothes parents pay attention to whether have labeled garment dry-cleaned. "not" If no such marks the infant of clothing, either a businessman inventory,cheap Tiffany Sale, or is not up to the new national standard. Carrefour zhongguancun store,Timberland Shoes, reporter random picked up a children's clothes pants,Ugg Boots, above does not "be dry-cleaned" clew. The reporter asked the counter salesman,Discount Tiffany's Rings, whether to have new infant clothing standard effect. The salesman said: "yes, but new clothes just on the counter, this array is too busy and haven't come yet and affix reminder." Say that finish, her from the drawer take out a less than 1 centimeter wide pieces posted on certificate.

And in SiTongQiao some nearby roadside infant store, the reporter sees many brands of infant clothing is still in use of the old symbol. The reporter asked staff, infant clothing can be dry-cleaned? Its answer, cotton clothes,Hermes Handbags, can be dry-cleaned. However, some sales personnel for infant clothing of new standard didn't know, some young parents are not informed.

This expert reminds, parents want to take the children dressed beautiful some, but from safe Angle, don't buy colour too bright-coloured infant clothing, lest contains biodegradable aromatic amine such harmful substances. Biodegradeable aromatic amine is a kind of poisonous and harmful to human body dyes, dye if be absorbed through skin,mbt mwalk, can spread in the human body,eisterstuck classique, cause human body lesions. Biodegradeable aromatic amine dye low prices, strong tinting, some textile enterprises to use its as clothing dyeing materials. October effect of the infant formul dress standards ", has been clear about the standard of measurement indicators, such as baby clothing for the extraction of heavy metal content, arsenic levels shall not exceed per kilogram of 0.2 mg, formaldehyde content must be less than or equal to 20 milligrams per kg. The standard is pointed out that, because of dry lotion in infants may contain stimulation of skin substances, infant clothes must in logo marked "not dry-clean".
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