3 运动定律与简便运算
计算(能简算的要写出简算过程)
①7968﹣2968÷28×27 ②5.47﹣3
+3.63﹣2
③(8.8﹣23.4×
)÷
④
⑤12.5×2.5×12×
⑥[1.6﹣(
)×
]÷
.
计算:(能简便的就用简便方法计算)
(1)(
﹣
)×(
+
) (2)95.6×18﹣95
×8
(3)(
﹣0.005×700)÷
(4)[2﹣(
﹣0.5)÷
]×
.
直接写得数
(1)1997+19998+1999+6=
(2)3.6÷0.36=
(3)41×101=
(4)
﹣
+
=
(5)0.22=
(6)(50+
)×
=
(7)
×10÷
×10=
(8)0.75×
+
×
= .
计算下面各题,能简算的要简算.
(1)975﹣384÷16×25 (2)
÷(
+
)+1.65 (3)5.25+3
﹣1.8+2
(4)
×1.5﹣1.5×
(5)12.5×0.25×32 (6)36×(
+
)÷2%
选择适当的方法计算.
(1)7.83﹣0.24+(2.17﹣1.26) (2)
×17﹣12×
(3)
×[
÷(
×
)]×(1+
)×(1﹣
)×(1+
)×(1﹣
)×…×(1+
)×(1﹣
)
用递等式计算(能简算的要简算)
(7001﹣3075)÷13×25 105×(
+
+
) 11.2﹣0.33+2.8﹣8.67 473÷2+473÷3+473÷6.
800﹣345÷15×8+263 13.5÷[1.5×(1.07+1.93)]
﹣
+
﹣
+
﹣
﹣
+
﹣
+
1
+2
+3
+4
5
﹣(2.375﹣1
)﹣3
.
41.2×9.2+412×0.08 37﹣0.37×8.28﹣3.7×0.172.
用递等式计算,能简便计算的要用简便方法计算.
38%×
+0.4×
89×6.3+48.9×0.37
﹣(
﹣
)
2.5×
×0.4×
158﹣92+42﹣8 83.2÷(83.2÷11)





+12÷
+40%
.
) (2)12×(0.25﹣
) (3)28x0.36+280×0.064 (4)13×0.25+5÷4.
+0.125) (2)3
×7+6.25÷
)
﹣3.6+6.15×3
.
+9
+999
(2)4
(2
)
1
(4)(111+999)
.
(2)
(4)
.
×[0.75﹣(
﹣
)] (1﹣
)÷[(0.1+1.1)÷0.2].
×
﹣
+(
﹣
)÷
.
17.48×27+1.9×174.8﹣1.748×460.
.
②37.5+12.5÷2.5×4 ③
⑤125×3.2×25 ⑥777×
.
(2)5.4﹣(0.4+12×0.25)
(4)
(6)
.
.
= 4×0.8×2.5×12.5=
=
= 
=
+3)×1
﹣(
÷0.4+
×3.8)
﹣1.25×
)×(7
+0.625)
×[
﹣(
﹣
)] ③
×18+32×
÷[(
+
].
+0.35×25% (2)(
+
)÷
+
(4)(111+999)÷
.
﹣1.5)×
]÷
②
÷
﹣1.4×
+7+
×20%
(2)
+99
+3×
(4)解方程:3x﹣0.8×75%=2.1.
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