1-[(3+2×20-4×3)-(7+9÷9)×4]÷7=; (3×2-5×0+3×3-17÷17)×2-24÷2=; (2+3+4+5)÷7+(26÷2+4×2)÷21=; 16÷(8+2-6)+2×6+6=; ; 27÷(3+2-1-1)+2×6+9=​