480÷60= 50×80= 30×40=
7×(48÷4)= 8×250= 5×3÷5×3=
81-81÷81= 40+60÷3= 11×(8-5)=
①56×7÷4
②643-18×31
③75×(26+14)
④498÷(250-244)
5.5+4.5= 6.2-5= × = 2.4÷0.2=
+ = 3×20= ÷ = 0.44×5=