3 运动定律与简便运算
计算(能简算的要简算).
①250×16﹣4848÷24 ②(3+
)×5 ③
×
﹣
×
④
÷23+
×
⑤
×[1﹣(
﹣
)] ⑥3.6﹣2.8+7.4﹣7.2.
脱式计算:(能简算的要写出主要简算步骤)
①(
+
)×24 ②1080﹣63.58﹣36.42 ③(
+
)÷(
﹣
)
④
×[
﹣(
﹣
)] ⑤
+
÷
×
⑥9.05×37+64×9.05﹣9.05.
神机妙算细又巧!(简算要写出简算过程)
2004×
= ; 3.68×〔1÷(2.1﹣2.09)〕= ;
0.2×1.25×50×7×8= ; 198÷
+202×
= .
计算下面各题,能简算的要简算.
38.75﹣15.38+61.25﹣4.62= 80
;
= ;
×9.3+9.3×2.25= ; 4.05﹣2.83﹣0.17= .
计算下各题,能用简便方法计算的要用简便方法计算.
12×
= ; 47×
= ;
÷23+
×
= ; 0.25×13.8+6.2÷4= ; 6.48÷[(3.3﹣2.7)×0.9]= ;
= .
下面各题怎样简便怎样算.
6.13+28.86+13.87+1.14 12×97+1.2×30 71÷60﹣68×
8.8×(3.75﹣1.25)×1.25 (
+
)÷
(
﹣
)×9×41.
直接写出下面各题的结果.
24÷0.8= 3.82﹣1.80= 2.6÷20%= 6.28×0.5= 10﹣2÷7=
408×10%= 8.4÷3= 2.02+0.4= 2.8÷0.1= 5.4+8=
1÷0.2×1÷0.2= 0.125×2.5×8= 1÷
×
= 2﹣
﹣
= 1÷
×
=
×
÷
×
=
用递等式计算(能简算的请简算).
①646+136÷17×25 ②44×(
﹣
) ③7.5×46.7+52.3×7.5+7.5
④(2﹣
×
)÷
⑤
÷15+
×
⑥[(
﹣
)×
]÷
.
正确、合理、灵活地计算下列各题.
2.75×
+2
÷2
(
+
﹣
)×24
8.08﹣4.73﹣1.08﹣1.27
×[(1.5+
)÷(
﹣
)].
下面各题,怎样算简便就怎样算.
4×0.8×2.5×1.25 〔(
+
)÷
〕×
1﹣(
﹣
)×3
98+99×98 (
+
)×
4.2﹣1.38+5.8﹣3.62.





+
)×13 3.9﹣5.7+7.1﹣2.3
÷[
×(
﹣
)].
﹣
+
= (
+
)×12=
×8= 10﹣0.9= 8.2+0.54+0.46=
=
×5.3﹣
÷4+
×
×9﹣
﹣(
+
)÷
.
+
)×105 1.25×32×0.25.
×3.6+
×0.75.
×9+
(
+
)×15×17
×12﹣
×
+
×
+6.28+
﹣4.28.
+12×0.25+10×25%
﹣
÷3.
+0.75﹣
= ;
+
﹣
)×12= ; ④
+
×
÷2= .
= ; 8×7×1.25= ;
×8.8+0.6×
+60%= ; 1.2﹣0.5×1.8÷0.9= .
= ;
= ;
= .
×[1÷(
﹣
)]
×67+
﹣5.75﹣14.25 ③1.25×0.25×32 ④56×(
﹣
+
)
)÷
0.6÷[
÷(
+
)]
×
+
÷
.
粤公网安备 44130202000953号