用递等式计算,能简便的要用简便方法计算,写出必要的计算过程 7280-280×12 1650-78-222+350 1230÷6+15×13 41×(982+760÷38) 1472÷[﹙2100-1364﹚÷23].
(1)7280-280×12, =7280-3360, =3920; (2)1650-78-222+350, =(1650+350)-(78+222), =2000-300, =1700; (3)1230÷6+15×13, =205+195, =400,; (4)41×(982+760÷38), =41×(982+20), =41×1002, =41082; (5)1472÷[﹙2100-1364﹚÷23], =1472÷[736÷23], =1472÷32, =46; |