3 运动定律与简便运算
脱式计算,能简算的要简算.
(1)772﹣317+128×5 (2)(
﹣
)÷(2﹣
) (3)1.75+6.8+3.2+0.25
(4)17×99+17 (5)120÷〔45×(1﹣
)〕 (6)86.5﹣(1.7×6+0.8)
下面各题,怎样简便就怎样算.
(0.86+0.86+0.86+0.86)×25 0.2+(3.4+
)×
7.6×
÷[1.9﹣1.9×(1.9﹣1.9)] 74
×19+19×25.4.
用递等式计算.(能简算的要写出主要过程).
168.1÷(4.3×2﹣0.4) 101×26﹣52÷2 8﹣
×5﹣
2﹣
÷
÷75% 3.5÷[(
﹣
)×3] (10.4×7+10.4×2﹣10.4)×
.
直接写出下面各题的得数.
+
= 24.1÷0.01= 8×125%= 0.25×32=
﹣
+
=
×8+8×
= 1﹣
+
= 2.5×4÷2.5×4= 7.48﹣(2.5﹣3.48)= 1﹣
÷
=
计算下面各题(可简便计算的应简便计算).
(1)3.87+1.44﹣0.87+0.56
(2)58.8÷2.1﹣1.6×3.5
(3)(
+
)×21
(4)5.16×8.5+1.5×5.16
(5)
×(
+
)÷
(6)
×[
÷(
﹣
)].
=
= 0.32=
=
﹣
=
×8=
﹣
﹣
=
×
)×(12×17)
÷(
+
)×
3
×7.4﹣3
+3.6×3.125 42
÷7 52.75﹣
﹣9.625.
×3.5+5.5×80%+0.8 (2)(8.8﹣23.4×
)÷
÷(
+
×
)
+
=
÷
+2÷
﹣
×101﹣
﹣
③(
+
)÷
﹣
④
﹣(
+
)÷
.
﹣
) ④
×0.4+
×
+0.4×
.
(2)3.3×
+0.75×5.7+75%
+
﹣
)×12
﹣15.38+61.25﹣4.62
+1.25×1.09
+
×(1﹣
)].
÷[(
+
)×
] 0.5×
+0.8×2.5+7×
) (
+
)×15×17.
×153﹣0.6×53 80.7×8.7+8.07×13.
21÷(
+
)÷
÷[(
﹣
)÷
×
÷
②(
﹣
)×
③0.75÷(
+
)
÷
﹣
⑤7.8×101 ⑥(
﹣
)×(
)
÷
×64﹣1
×[
﹣(
﹣
)]
÷
.
)÷
0.25÷
+0.25×
2.8×
+1.2÷
)] 7.2+[(7.8+
)÷0.4]
.



.
)〕 ②
÷4+
×
×8×27 ④1.9﹣1.9×(1.9﹣1.9)
÷
﹣
×2
5600÷25÷8
.
×0.6+0.6÷
.
×
+
÷6.
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