①836-192÷8×16
②1.4÷(1.4+0.7)
③0.8×0.4×12.5×0.25
④ ÷6+ ÷20
⑤14×19×( + )
⑥ ÷[( + )÷ ]
2.1÷ = × = 52×79≈ 2.5×7.8×0.4=
×4.2= 10.4﹣0.8= 44÷ = 0.11÷0.1=
÷ = 8.7÷29= × = 6×( ﹣ )=
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)
67% 3.5×0.99 3.5÷0.9
60×20= 0÷36= 7.2+2.87= 908﹣303≈ =