(1)1.25×9.76×80, =1.25×80×9.76, =100×9.76, =976; (2)3.2×2.5, =0.8×4×2.5, =0.8×(4×2.5), =0.8×10, =8; (3)23.6×99+23.6, =23.6×(99+1), =23.6×100, =2360; (4)36.7+63.3×2.4, =36.7+151.92, =188.62; (5)54.3÷4÷2.5, =54.3÷(4×2.5), =54.3÷10, =5.43; (6)0.75×18÷0.15, =0.75÷0.15×18, =5×18, =90. |