4.
脱式计算
(1)739+329-789=
(2)624÷26+14×23= | (3)24×12 -13×4= (4)3 ×(158- 68)= | (5)946-966÷46= | (6)(680 - 280)÷ (12 +38)=
| (2)36×73+73×63+73= | (3)35×(70-400÷25)= (4)8.8+0.56+1.2+3.44= | (5)400-133-75-67= | (6)20.75+0.4-7.86=
| (2)(125×6- 630)÷60= (3)65×99+65= | (4)125×23×8=
| (2)168-65+32-135= (3)125×32×25= | (4)65×65+65×33+65×2=
|