题目
递等式计算.
①1320﹣225+775
②4080÷[145﹣(79+26)]
③3200÷(5×32)
④843﹣(166+543)﹣44
⑤800﹣80÷8×10
⑥56000÷125
答案:①1320﹣225+775 =1095+775 =1870 ②4080÷[145﹣(79+26)] =4080÷[145﹣105] =4080÷40 =102 ③3200÷(5×32) =3200÷32÷5 =100÷5 =20 ④843﹣(166+543)﹣44 =843﹣166﹣543﹣44 =(843﹣543)﹣(166+44) =300﹣200 =100 ⑤800﹣80÷8×10 =800﹣10×10 =800﹣100 =700 ⑥56000÷125 =(56000×8)÷(125×8) =448000÷1000 =448