9 12×(+-) ×× ×÷ Р(1+)×10 36×+36× 4÷- 98÷(÷) 21×(1+) 12×(÷)Р ×24+24× ×÷ +÷ - × (- )× 22÷(+)Р÷3- 1÷(÷) +- 35÷(÷) ×(- ) ××39Р×5 +×5 - × ×+Р三、解方程Р3x= x=10 x=25 x= x=6 x=7 x=4Рx= 8x= x =6 x =1 x= x=54 x=35Рx =16 1.5x =28.5 8x=42 4+x=102 x-x= x-0.8x=22 20% x = 30Рx+x=42 x-= x+=6 6 x+x=9 2x -x= x+=12Рx-x =15 x = x-x =120 x ÷ = 5 + x =13 Р四、直接写得数Р3×= ×3= 2×= 5×= 6×= ×2= 3×= ×12= Р10×= ×16= 7×= 4×= 21×= 12×1= 12×= 12×=Р1×3= ×3= ×3= 5×2= ×2= ×2= 5×= ×6=Р100×= ×4= 21×= ×4= ×= ×= ×= ×=Р×= ×= ×= ×= ×= ×= ×= ×= Р×= ×= ×= 75×= ×140= ×= ×9= ×=Р×= ×= ×= ×= ×2= ×= ×= ×=Р×= 2×= 7×= ×5= ÷2= ÷3= ÷6= ÷12=Р÷5= ÷9= ÷10= ÷6= 2÷= 2÷= 2÷= 8÷=Р÷3= 6÷= ÷= ÷= ÷4= ÷= ÷= ÷7= Р÷= 6÷= 6÷= 6÷1= 6÷= 6÷= 8×= ÷4=Р÷= ÷4= ÷= ×= ÷= ÷= 7÷= +=Р÷2= 100×= ×= 12÷= ÷= ×= ÷= ÷=Р-= 24×= 1÷= 5÷2= ×7= ÷12= ×= 28×Р÷= ×= ×18= ×= 1÷= -= 100×=