4.5×2= 4×2.5= 2.4× 0.5= 6.95-1.95-0.7=
8.4÷4= 9.9÷0.1= 0.8 ÷2+2 = 6.8+5.5-6.8=
①5.4×7.8=
②2.6×0.25=
③109.2÷0.42=
④0.66×0.42≈(得数保留三位小数)
⑤21÷24 =
①25.63+3.7×2.8
②9.2+9.728÷3.2×1.5
③8.6×10.1
④8.4÷0.2÷0.5
⑤9.9+9.9×99
⑥5.78 ×2.57+2.57×3.22+2.57
并标出点D(10,4 )的位置。