If a 1m wide straight path is built on a lawn with length of AM and width of BM, the area of the remaining lawn can be expressed as______ M2; now in order to increase the aesthetic feeling, the path is changed into a curved path with a width of 1m (as shown in the figure), and the remaining lawn area is______ m2．

If a 1m wide straight path is built on a lawn with length of AM and width of BM, the area of the remaining lawn can be expressed as______ M2; now in order to increase the aesthetic feeling, the path is changed into a curved path with a width of 1m (as shown in the figure), and the remaining lawn area is______ m2．

The area of the remaining lawn is a (B-1) if its length is a and its width is (B-1); the area of the remaining lawn is a (B-1) if its length is a and its width is B-1

If a 1m wide straight path is built on a lawn with length of AM and width of BM, the area of the remaining lawn can be expressed as______ M2; now in order to increase the aesthetic feeling, the path is changed into a curved path with a width of 1m (as shown in the figure), and the remaining lawn area is______ m2．

The area of the remaining lawn is a (B-1) if its length is a and its width is (B-1); the area of the remaining lawn is a (B-1) if its length is a and its width is B-1

In order to increase the beauty of the lawn, a straight road with a width of 1m is built on a lawn with a length of M and a width of M, then the area of the remaining lawn can be expressed as
If a straight path with 1m width is built on a lawn with m length and m width, the area of the remaining lawn can be expressed as & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;; now, in order to increase the aesthetic feeling, the path is changed into a curved path with 1m width (as shown in Figure 6), then the area of the remaining lawn is & nbsp; (& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;); ）In fact, according to the method of graph, the area can be calculated as AB-A by using the cutting method. But if you think about it, the straight one is also ab-a. is the area of straight one the same as that of curved one

M (M-I) square-m
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As shown in the figure, on a rectangular grassland with a length of a m and a width of B M, there is a curved path. If the left line of the path moves to the right 1 m, it is its right line, then the green area of this grassland is ()
A. （a-1）（b-1）B. a（b-1）C. ab-1D. （a-1）b

The left line of the path is shifted to the right 1 m, the width of the road is 1 m, the length of the green space is (A-1) m, and the area of the green space is (A-1) B