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Junior one math! ! ! ! ! ! ! ! !
1) ①115-x2 general donation 10X second-class donation10x0.4 (1kloc-0/5-x)+5x0.6 (/kloc-)

1* * Donation10x+805-7x = 3x+805 ③ 3x55+805 = 970 yuan.

2) 6a+8b/2 = 3a+4b3a+4b-(2a+3b) = a+b Select B.

3)AD=AC+CD AC=AB/2=3, then CB=3 CD=CB/2= 1.5.

So AD=3+ 1.5=4.5.

Hope to adopt! You can ask again if you don't understand.

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