3 运动定律与简便运算
脱式计算与简便运算
=
=
=
=
6﹣
×
﹣
= 〔1﹣(
﹣
)〕÷
=
=
=
5+3.6×2.5÷0.48=
=
=
=
3.6×2
÷16.9÷(3
×1.1 6)×1.3=
+
+
+…+
= .
(4.5×1.1×4.8)÷(3.3×0.8×0.5) 12.5×2.5×0.8×4. 6.3×
+3.7÷
7÷(7﹣7×0÷7+7÷7) 18×45×(
+
) 2.25×
﹣2.75×
+3×225%
299×101 2
+3
﹣3
+1
+1
24.6×4.6+246×0.44+24.6
×27+16×
9900÷25÷4
×98+
×2
11﹣
﹣(
×
+
×
)
+4﹣(
+
)
1999+999×999 20.07×1994﹣19.93×2007
0.125×32×2.5 2002×
12
﹣2
×3
÷2
0.65×6.4﹣6.5×0.54+65×9%
9999
+999
+99
+9
+4
×98+2÷
×8+
×3﹣
35×
+35×
+35×
2.25×1.8+17.5×0.18 (
+
+
)÷
.
脱式计算,怎样算简便就怎样算
①600﹣480÷12
②9×
÷
③(80﹣9.8)×0.6﹣2.12
④35×(1﹣
)÷
⑤3÷[
×(
﹣
)]
⑥(1﹣
)×(
+
)
计算下面各题,能简算的要简算.
(1)(
+
)×15 (2)
×
+
×
(3)
×
×
(4)2.5×97×0.4 (5)1.25×97×8 (6)1.25×32×2.5×97
(7)0.36×101 (8)0.36×98 (9)
﹣
×
(10)
+
×
(11)
+
×
(12)
﹣
×
(13)90×
(14)86×
(15)
×
﹣
×
(16)0.36×101﹣0.36 (17)0.36×99+0.36 (18)
×
﹣
.
(1)1125﹣997 (2)12
﹣(1
+2
) (3)(
﹣
)×12
(4)4.35+4.25+3.65+3.75 (5)17
﹣3
﹣4
(6)22.3﹣2.45﹣5.3﹣4.55
(7)187.7×11﹣187.7 (8)998+1246 (9)400÷125÷8
(10)1
×2
×
(11)34×(2+
) (12)3.4×99+3.4
(13)
÷2
+
×
(14)(
+
+
)×72 (15)43
×
+57.125×
﹣0.5
(16)4
+3.2+5
+6.8 (17)25×(37×8) (18)125×8.8
(19)17.15﹣8.47﹣1.53 (20)0.125×0.25×32 (21)4.25﹣3
﹣(2
﹣1
)
(22)2.42÷
+4.58×
﹣4÷3.
脱式计算.(能简算的要写出简算的主要过程)
12×(
+
﹣
) 920÷40+23×99
×(4.85÷
﹣3.6+6.15×3
)
×[0.75﹣(
+25%)].
×
÷15
﹣
+
×
+
÷
+
+
÷
×
÷(
﹣
) 25×3.2×125
(
﹣
+
)×24
÷(
+
)×
18÷(
﹣
)
32.6×33﹣32.6×23
﹣
÷3+
×101﹣
.
直接写出得数.
20×10= 9×9+9= 50×2÷100= 25×5÷25×5=
180÷90= 5×19×2= 100÷50×2= 25÷5×25÷5=
口算:
2400÷200= 770+140= 11×500= 9900÷900= 22÷22×56÷56=
12÷(10×6﹣54)= 87+87÷87﹣87= 50×42×20= 970﹣174﹣326= 1250×80=






.

= (
)×12=
﹣
+
)
÷[(
+
)×
]
﹣
)×3].
﹣
=
12.5%= 4÷4÷
=
×6=
)= (
﹣
)÷
=

.
÷[1÷(
﹣
)].
.
.
×7.7﹣0.6
÷
×
÷
.
+
+
+
×80%+
÷(4﹣
﹣
)
÷
×
)×
.
=
=
=
=
=
=
+
×l5+0.7×
+
×l5.
﹣
=
+75%= 4π×25%=
+
×32=
+
= 1÷
×
= 0.5﹣
+0.5﹣
=
= (
)×24= 7÷
×7÷
2
×3
×5
÷(3.35×5.625×2.12)
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