lf half of a number is 30,then three-quarters of it is____.A.forty B.forty-five C.sixty D.fifty

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lf half of a number is 30,then three-quarters of it is____.A.forty B.forty-five C.sixty D.fifty

lf half of a number is 30,then three-quarters of it is____.A.forty B.forty-five C.sixty D.fifty
lf half of a number is 30,then three-quarters of it is____.A.forty B.forty-five C.sixty D.fifty

lf half of a number is 30,then three-quarters of it is____.A.forty B.forty-five C.sixty D.fifty
选B
如果一个数的一半是30,那么这个数的四分之三是(?)
设这个数是 x
则 1/2 * x =30
得 x= 60
那么 3/4 * x =3/4 *60 = 45

选B
如果一个数的一半是三十,那么这个数的四分之三是()
数学自己算吧。

如果一个数的一半是30,那么它的4分之3是多少?
30的倍是60,60的四分之三是45,所以是b