怎样算简便就怎样算.103×25﹣4230÷30 30÷2.5﹣1÷22÷(﹣)×20%25÷[1÷(﹣)].
直接写得数25×10%= ×27= ()×60= =72÷= 45×= 1÷= =
计算+2.4 ÷4 ×÷9 1.68﹣ ÷2÷
= = = == = = =
想一想,括号里能填整数几?(1)÷12=(2)÷3=.
(1) (2) (3)(4) (5) (6).