文档介绍：+15 × 6= ÷5× 8= ×5÷2× 4= × 3+8= ÷ 4+20 × 5= +12 ÷ 3+20= 7.(80 ÷ 20+80) ÷ 4= +(100-10 × 5)= ÷ 40= × 20= -25= +45= × 2= × 6= × 6= ÷ 9= × 20= ÷ 4= -80= +70= -64 ÷ 8= ÷ 6+20= -5 × 7= +60 ÷ 3= +18 ÷ 2= -11 × 5= +7-29= ÷ 80= × 16= × 25= × 11= ×8× 5= -3 × 200= +20 ÷ 2= -25 ÷ 5= +8-40= ÷ 40= ÷ 14= ÷ 24= ÷ 14= ÷ 13= ÷ 15= ÷ 24= ÷ 25= ÷ 16= ÷ 21= ÷ 14= ÷ 13= ÷ 15= ÷ 24= ÷ 17= ÷ 15= ÷ 16= ÷ 26= ÷ 17= ÷ 40= ÷ 20= ÷4= ÷ 40= ÷4= ÷ 60= ÷2= ÷ 25= +70= ×9× 4= -33 × 3= -1010= × 50= × 8= × 11= ÷ 25= -2200= +80= ÷4= ÷5= ÷8= ÷4= ÷6= +80 = -80 = × 80= ÷ 80= ÷ 16= ÷ 24= × 5= × 250= × 518= × 76= × 10= × 6= × 3= × 18= × 4= × 15= × 30= × 15= × 12= × 30= × 50= × 700= +15 × 6= ÷5× 8= ×5÷2× 4= × 3+8= × 25= × 11= ÷ 25= +70= ×9× 4= -33 × 3= -1010= × 50= × 8= × 11= ÷ 25= -2200= +80= ×8× 5= -3 × 200= +20 ÷ 2= -25 ÷ 5= +8-40= ÷ 4+20 × 5= +12 ÷ 3+20= 7.(80 ÷ 20+80) ÷ 4= +(100-10 × 5)= ÷ 40= × 20= -25= +45= × 2= × 6= × 6= ÷ 9= × 20= ÷ 4= -80= +70= -64 ÷ 8= ÷ 6+20= -5 × 7= +60 ÷ 3= +18 ÷ 2= -11 × 5= +7-29= ÷ 80= × 16= ÷ 40= ÷ 14= ÷ 24= ÷ 14= ÷ 13= ÷ 15= ÷ 24= ÷ 25= ÷ 16= ÷ 21= ÷ 14=