3 运动定律与简便运算
(1)
=
(2)
=
(3)31.4+15.19+20.6+32.81=
(4)
=
(5)
=
(6)
=
(7)9+19+199+1999=
(8)0.9+0.99+0.999+0.111=
用你喜欢的方法计算下面各题
÷〔
×(1﹣
)〕 (
﹣
)×
(20﹣1.25×0.8)÷0.19 6.88×7.8+3.2×6.88﹣6.88
5.58﹣
+5.42﹣
325×0.36+6.75×36.
脱式计算(能简便的要简便计算)
÷[(
+
)÷
]
×
+
÷4 4.2×102﹣8.4
÷(1﹣
)×
3.64÷4+4.36×25% 1110÷[56×(
﹣
)]
36﹣
X=18
:x=6.
脱式计算,写出主要计算过程,能用简便算法的要用简便算法.
①12×
÷
②(
+
)×36 ③
+
×13
④3.6﹣2.8+6.4﹣7.2 ⑤2﹣
÷
﹣
⑥(
+
)÷(1﹣
)
×[
﹣(
﹣
)] (
)÷
+
) 7.05×37+64×7.05﹣7.05.
.
﹣2.5×
(2)3.5×
+5.5×80%+0.8
)÷3] (4)3.25﹣2.8×
÷0.1.
﹣
×
﹣
﹣(
﹣
)]×
.
+
)
×
+
÷
×〔
﹣(
﹣
)〕
÷[(
)÷
]
÷7+
.
﹣
)÷
﹣
15.73﹣(8.69+3.73)
.
+
7.25﹣0.87﹣2.13 1236+998 12.5×
×0.8×
.
13.7﹣1.4+0.6 
66﹣195÷3+1498
.
= 1.25÷0.125=
﹣(
)= 1÷
×4=
×55+66=
×9÷
×
+
6
﹣(0.63+4
)
+1÷3.8×3
+3.5 (36
+54)÷9.
+
)÷
+
+5.28+
+4.72
.
×
+
﹣
+
÷
③
×(347×16×26)×
.
+
)÷
+
×
+
×
×21+13×
.
÷(1﹣
) 75×0.5+15÷2
﹣8×
(
﹣
)×45.
÷7+
×
×
÷(
﹣
) [
﹣(
﹣
)]÷
3﹣
×2﹣
.
﹣15+
÷12×
= 8.5﹣(
﹣1.5)=
+
)×35;
+
×(
﹣
); 3.5×72+65×7.2;
﹣(
﹣
);
=
;
χ+20%χ=
; 20.2乘0.4的积再加上7.88; 87×
.
)÷
+
+
)]÷
+
×
623÷2.5÷4 1620+450÷9﹣25
(
+
)÷(
﹣
]÷
.
÷2
﹣1
×
÷7+
×
(
﹣
+
)×60
×0.25+
÷4﹣
×0.375﹣
÷
﹣
÷
﹣
302×15﹣6950÷50.


.
= 72÷1.2+72÷1.8= 888+3÷7÷6×14=
=
=
×[1﹣(
﹣
)]
+
﹣
)
+
)×135.
﹣
+
﹣
×
+
÷8
÷[(
+
)×
] 5.4×3.6+64×0.54.
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