1.85﹣+= 1÷×= +0.375=
2.4﹣= (+)×2.4= 5÷×5÷=
10×45%= 1.25×8= 40×(1﹣20%)=
①772-317+128-283
②2.4÷( -20%)
③1-
④5.125× +2.875÷4
⑤