1)7×5+24:8=
35+3=38;
2)3×3×5-9=
9×5-9=
45-9=36;
3)12+72:9×3:6=
12+8×3:6=
12+24:6=
12+4=16;
4)28:7:2×9:3×6:4=
4:2×9:3×6:4=
2×9:3×6:4=
18:3×6:4=
6×6:4=
36:4=9;
5) (5+5×5):6×2×4:8=
(5+25):6×2×4:8=
30:6×2×4:8=
5×2×4:8=
10×4:8=
40:8=5;
6)(7×7+28:4):(81:9-12:6)=
(49+7):(9-2)=
56:7=8;
7)36:6:3×9:6-36:9×6:8=
6:3×9:6-36:9×6:8=
2×9:6-36:9×6:8=
18:6-36:9×6:8=
3-4×6:8=