×3÷×3 25×7×434÷4÷1.7 1.25÷×0.8
计算下列各题,能简算的要简算。×× (10+)× +÷×4+ +× ×(÷)
(-)×
×÷
+-
1--
口算。+= -= += - +=0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
10-÷×1
÷=
-=
27×=
10-=
计算:
简便计算: