(1)26.7+3.3×1.2+0.04 =26.7+3.96+0.04, =26.7+(3.96+0.04), =26.7+4, =30.7; (2)4.8×12.5×0.8 =0.8×12.5×4.8, =10×4.8, =48; (3)2.5×(6+9.728÷3.2) =2.5×(6+3.04), =2.5×9.04, =2.5×(10-0.06), =2.5×10-2.5×0.06, =25-0.15, =24.85; (4)24×10.2 =24×(10+0.2), =24×10+24×0.2; =240+4.8, =244.8; (5)6.3÷(2.1×2) =6.3÷2.1÷2, =3÷2, =1.5; (6)100.8÷[(10.79+6.49)÷4.8] =100.8÷[17.28÷4.8], =100.8÷3.6, =28. |