75×12﹣848÷4 [-(-)]÷ 9.24÷[1.5×(0.9﹣0.7)]
40×25%= 1.03×10= 3×45= 1÷10%= 2.8×=
1.57﹣0.85= 0.49÷0.7= 3.05+6.2= 0.6:0.75= kg:40g=