用简便方法计算362971214解方程342x1336×(2/9+7/12-1/4)=36×2/9+36×7/12-36×1/4=8+21-9=203/4-2x=1/33/4-1/3=2x9/12-4/12=2x5/12=2x5/24=x2,563413用简便方法计算=10/12+9/12-4/12=15/12=5/45/4-1/3+2/3用简便方法算?=5/4+(-1/3+2/3)=5/4+1/3=15/12+4/12=19/123,3x424x32用分解因式法怎么解(3x-4)2=(4x-3)2移