①8×1.25=
②678+206=
③+=
④×7.2=
⑤3.2a﹣a=
⑥2.875+
⑦18.23﹣2.3=
⑧3÷=
⑨633÷91≈
⑩59×42≈
0×5.16= 9.8+2.6= 502-399=
÷4= × = 20×5=
4+0.7x=102
x=3600
×= 0.54÷6= ÷= 2.6×0.3= 27.8﹣1.9=
0.9﹣0.45= 2.7+0.3= 4÷ ×4= 9÷0.9=
0.12×0.8= + = ÷ = 2.1﹣0.21=
2.5×4+2.5×4= + = - = 0.6﹣0.06=
420﹣298= 4+5.6= = =
0.25×0.4= 0.133= = =
甲商店:买一大瓶,送一罐;乙商店:一律九折;丙商店;满30元即享受八折优惠。问: