3 运动定律与简便运算
计算
①5.2×
+
÷
②
﹣(
+
+
) ③[3.75﹣(
+
)×
]÷
④
÷(0.6×1.25+
+
) ⑤(
×2+
+
)÷4 ⑥
⑦(
×4.27+8.54×
)÷4.27×25% ⑧
+
+
+
+
.
计算 (能简算的要简算,解答时,必须写出必要的解题步骤)
(1)[20.75+(3.74﹣
)÷
]÷41.75
(2)
+
+
+
(3)(3.91+
+6.09+
)×(
﹣1.125)+(1÷
﹣1.5)×6.04.
计算,能简算的要简算
(1)13﹣1
﹣1
(2)1﹣6÷3×
(3)75×80%+24×
+0.8
(4)(
+
+
)×24 (5)42
÷7 (6)1
÷(
+2
+
)
(7)33333×66666+77778×99999 (8)
+
+
+
+
+
+
.
(1)2001×20022002﹣2002×20012001 (2)2000﹣1+9×111×999
(3)
(4)2008﹣1+2﹣3+4﹣…+2006﹣2007.
用简便方法计算
①4.85×3
﹣3.6+6.15×3
②0.025×999×2.8×40÷2
③(
﹣
)×23+25÷71+15
÷23 ④9.81×0.1+0.5×98.1+0.049×981
⑤1000+999﹣998﹣997+996+995﹣994﹣993+…+104+103﹣102﹣101.
怎么简便怎么算,并写出主要过程.
①1.25×32×2.5 ②4
×3.5+4.8×7
﹣480%
③(5
﹣1.8)÷[(1.15+
)×1
] ④3333×224+6666×368.
计算下列各题,能简便都尽量简便.
(1)
(2)
(3)3.75×4.8+62.5×0.48
(4)
÷(
+
) (5)1991+199.1+19.91+1.991 (6)
×37.








]
}×
.
(2)
(4)97×2010﹣96×2011
.
+
÷
+
×
67×
+
+9÷13﹣1÷13×100
+
+
+
+
.
=
+4.37+5.63+6
=
+
)×15×17=
= .
﹣
+1
+1
= 0.25×0.3÷0.25×0.3=
×
+
)×12=
﹣
=
+1.5×
﹣3.25+2
﹣5.48
×
)÷(
﹣
) ④43×
+136×
+70×
.
+3
﹣3
+1
+1
.
×7.4﹣3
+3.6×3.125 10
﹣(8.8﹣
)+
14.4÷0.6﹣4.2×3.
﹣
)×17×5
=51:17 (4)
×7+4x=850%
:0.4=1.35:x.
+
+6.875+
.
(2)2.5×4.4
(4)
.
+
﹣
)÷
(8
﹣10.5×
)÷4
÷[(
+
)÷
].
﹣
÷
﹣
×2009 86×(
﹣
)×3.
﹣(3.625﹣2
)﹣4
.
+4.39﹣1
3.74×5.8+62.6×0.58
﹣
)+(
﹣
)+(
﹣
)+(
﹣
)+(
﹣
)
) 4×0.8×2.5×12.5 84
×0.375+105
×
.
﹣
÷4;
×
÷(
﹣
).
﹣
÷[
×(
+
)] ③(
﹣
+
)×12 ④5.7﹣(1.9﹣1.3)
897×
﹣37.5%+104×0.375
x﹣(1﹣80%)x=4.95 1
:(2﹣
)=45%:0.8.
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