3 运动定律与简便运算
脱式计算.(③小题在括号中先填上适当的数,使计算能够简便)
①0.8+4.9+3.2+5.1 ②(
+
﹣
)÷
③应用乘法分配律:6× + ×6
④解方程:1﹣75%x=
.
怎样算简便就怎样算.
356﹣199= ; (
+
﹣
)×12= ; 32×12.5×0.25= ;
+
+
+
= ;
×0.11+0.11×
= ;
÷[(
﹣
)
].
混合运算.(能简算的要简算)
45×102= ;
×40﹣
÷
= ;
7.85﹣1.89﹣2.11+2.15= ; 3450+450÷18×15= ;
40÷[(
﹣
)×3]= ; 168.8÷(24.3×2﹣6.4)= .
直接写出得数.
1.25×
×0.8= ; 45×99= ; 0.9×99+0.9= ; 25÷25%= ;
24
÷8= ;
+
÷3﹣
= ; 4÷
﹣
÷4= ;
×
÷
×
= ;
1÷2÷
= ;
﹣(
﹣
)= .
怎样简便就怎样算.
2.5×32×12.5 8×5×(
﹣
) 4.63+3
+5.37+7
×[(
﹣
)÷
] 17×
﹣
1.25×(
)
0.8+4
+
+5
2.05﹣0.81÷2.7×4.5 10.625×2005+2005×
﹣2005
÷(1
﹣
×
)+
8
÷[4.6+1
×(4
﹣1.15)] 9.8﹣(
+2.4×2
)
计算:
×[
﹣(
﹣
)] [
﹣(
﹣
)]÷
÷
+
×
1.3﹣3.79+9.7﹣6.21 68×35﹣408÷24 47.5﹣(0.6+6.4÷0.32)
1
+
÷4﹣
÷(
×
)﹣1
÷[
﹣(
+
)]
(
﹣
)×15.
计算下面各题,能简算的必须简算.
(1)
÷
+
÷
(2)5
+2
+4
+6
(3)
×(1
+37.5% )﹣
÷1
(4)95.6×18﹣95
÷
(5)(
﹣
)÷[(5﹣2
)÷3
] (6)(222+888)÷[5 6×(
﹣
)].
直接写出得数.
0.72÷0.09= 25÷20%= 98×101= 398+199= (25×0.25)×8=
2.9×4×0.5= 2.7÷
= 28
÷7= (2.4+3
)×
= 16
÷8=
(
+0.12)÷4= 1
×12﹣12×
= 7
÷7
= 4.4﹣4
= 7.75﹣(5.8﹣1
)=
(11.9+17.1)×
=





+
+
+
﹣
)
+
+
.
÷13+
×
54.2﹣
+4.8﹣
3.5×
+5.5×80%+0.8 56×99.
﹣
)
+
﹣
)
+(
﹣
)]÷17 43×
+57÷
.
÷[
×(
+
)]
÷(
+
×
)
÷[
﹣(
+
)]
×36 (4)解方程:6x+1.5=10.5.
×
+
4.6×99.
×(
+
)]
×20+16×
﹣
+8.4÷
﹣1
﹣1+3
)×(7.6÷
+2
×1.25)
÷9+
×
= ; 87×
= 3
÷
﹣
= ; (
﹣
)÷(
+
)= ;
÷[(
+
)×
].
×0.25+
×3.2 4﹣
(
﹣
+
)×24
÷〔(
+
)×
〕
÷60%=
﹣
)×30= 1.25×
×8=
+
﹣
×24×
②8.75×2
+8.75×7
+87
×{1﹣(
﹣
)} ④
÷23+
×
.
+
÷
73÷
﹣37×
1÷(15﹣
﹣
)
÷[(
+
)×
].
×16.31﹣
0.76×0.25+
×0.24
×0.8+
×80%+
×
.
=
﹣
= 0.56×
=
=
= 62= 求比值:
:
= 化简比:6:0.75=
×1.6+
×7.4 (2)2.8×
×
×0.7×
﹣4.5+
.
﹣(
+
)].
1.25×32×2.5
.
×(1÷
﹣
+
)÷
﹣
(
+
)×72.
﹣(
+
)]÷
.
粤公网安备 44130202000953号