3643-1925+1322=1718+1322=369
70+28=98 98:7=14
17+13=30 30:5=6
54+18=72 72:6=12
45+18=63 63:3=21
40+16=56 56:8=7
49+32=81 81:9=9
21+15=36 36:4=9
56+35=91 91:7=13
54 и 135= 270, 38 и 114=114, 150 и 400=400,180 и 300=300, 42,60 и 70= 420,18, 63 и 35=126.
1) S=9*9 2)S=11*11
S=81м2 S=121мм2