直接写数:= = = = == = = = =
脱式计算.20×24÷6 (35+24)×24 1200﹣8×25 23×12+40.
脱式计算(35+360÷45)×2003 9975﹣1740÷145.
脱式计算:402﹣[170﹣(169﹣135)] 72÷[2×(105﹣87)].
815﹣185﹣315 1872+472÷(205﹣197) 3360﹣360÷15×26688÷8+37×29 8000﹣(1532+457+543) (653+1977)﹣(453+277)
把分步算式合并成综合算式.1190÷14=8512×85=1020.