160÷40= 90÷30= 161÷40≈ 90÷29≈150÷50= 490÷70= 153÷50≈ 490÷71≈．
直接写得数．+= 1﹣=+=﹣= 1﹣28%=×16=×= 36÷=÷= 25×40%=
直接写出得数． 40×0.25= 1.25×0.8= 0.1÷0.01=0.6+1.9= 3.5﹣2.25= 12.8÷4=+=﹣= 12×= 1÷=×=÷=
直接写出得数 1﹣0.375= 0.125×8= 280﹣45= 1.3÷0.25= 400÷600= 8.64×100=+=﹣=×=÷= 12×= 6÷=
直接写出得数 0.5×400= 568﹣198=÷= 1÷﹣÷1=×12= 1.7+3.03= 13.5﹣5= 10﹣﹣=
24×0.5=+= 6﹣6÷6= 20×20%= 0.33= 7.2÷0.08= 4÷= 12.5×6.4=﹣= 121×=
+
= 1﹣
=
+
=
﹣
=
×16=
×
= 36÷
=
÷
= 25×40%=
+
=
﹣
=
= 1÷
=
×
=
÷
=+=﹣== 1÷=×=÷=
+
=
=
×
=
÷
= 12×
= 6÷
÷
=
﹣
×12= 1.7+3.03=
﹣
=
+
= 6﹣6÷6= 20×20%=
= 12.5×6.4=
﹣
= 121×
=
粤公网安备 44130202000953号