带括号的混合运算（2023-07-19）

带括号的混合运算（2023-07-19）：(52-42)÷2= (87-77)÷2= 72-(41-21)= 3×(54÷6)= 75-(49+14)= 20+(57+12)= 8×(54÷9)= 72+(83-63)= (49+14)÷7= 8×(35÷7)= 72+(83-63)= (49+14)÷7= 92-(87-39)= 29+(31-15)= 8×(35÷7)= 90-(75-57)= 83-(74-44)= 75-(32-18)= 6×(72÷9)= 42+(15+42)= 92-(70-19)= 83-(74-44)= 75-(32-18)= 6×(72÷9)= 90-(75-57)= 2×(16÷4)= 46-(68-61)= 4×(36÷4)= 39+(24+29)= 80-(12+14)= 67+(78-74)= 87-(82-51)= 24+(26-26)= 2×(3...