口算.
39÷
= (0.21+0.7)÷7= (
﹣
)×20= (0.56+0.69)×8=
×3÷
×3= 11.75﹣(
+5)= 7﹣4÷
= 2﹣
×
=
下面各题能简算的要简算
(10000﹣0.16×1900)÷96;
×[
÷(
﹣
)];
94×8.8+
×7﹣880%;
3.6﹣2.8+7.4﹣7.2.
直接写得数
380+250= 100﹣64= 15×5= 72÷3=
4.8+5.2= 10﹣0.4= 1.7×0.4= 8.4÷21=
+
=
﹣
=
×
=
÷
=
解方程
:
=18:x; 3x﹣6
=8.25.
能简便的用简便计算.
798+10570÷35 9.81×0.1+0.5×98.1+0.049×981
(1﹣
×
)÷(
+
)
+
+
…+
+
2008×20092009﹣2009×20082008 2
÷[5
﹣4.5×(20%+
)]
直接写出得数
127+38= 8.8÷0.2= 2﹣1
=
×1
=
1÷7+
= 1﹣1×
=
+
= 1.02﹣0.43=
÷25%×
=
×2÷
×2=