1, if the subtrahend 1 is regarded as 7, it will be reduced by 6; if the minuend 7 is regarded as 1, it will be reduced by 60, and together it will be reduced by 60+6=66, so the correct answer is the wrong answer plus 66, which is 234+66=300.

2. Let the prices of Party A and Party B be 7X and 3X respectively. According to the meaning of the question, the equation can be listed:

(7X+70):(3X+70)=7:4

7(3X+70)=4(7X+70)

2 1X+490=28X+280

X=30

A: 7*30=2 10.

3*30=90

3. The increased surface area is 2 (length * width) +2 (length * height) =200.

Length * width+length * height = 100

Length * (width+height) = 100

The sum of width and height is long, so length * length = 100, length = 10.

Width 10/4=2.5

Height 2.5*3=7.5

V=2.5*7.5* 10= 187.5

This question can be said to be not very strict. Because the cutting methods of transverse cutting and vertical cutting are different.