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 (++)÷.
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.
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=