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=
①4x-4=2
②
③7(x+ )=4.2
④=2.7:0.6
(本)