脱式计算，能简算的要简算①67.5×0.52+3.25×5.2 ②36×(56 + 79 )③42÷(65 ÷ 37 )④3.5×[(702-270)÷16]解扰蚂宽方程①缓亮34 x-2.5=5 ②物高53%x-36%x=51
