3 运动定律与简便运算
计算能简算的要用简便方法计算.
25×1.25×32×1.7= ; 78﹣4.5+22﹣
= ;
5400﹣2940÷28×27= ; 20×(
+
﹣
)= ;
(
)×5×4= ; 10÷[4﹣(
÷
+
)]= .
直接写出得数.
0.44+
+
+0.6
+2
×2
﹣2
÷
(4
﹣2
)÷(1
+2.4)
48200﹣156×720÷39 (3.06÷0.25+2.76)×0.2 [3
÷(3﹣2.4×
)]×0.2.
直接写出得数
0.9+99×0.9
×2÷
×2 36×25% 1.25×3.2×8
+0.75
(
+
)×
4.1×10.1 390×2%×
10÷10%
+0.6+30%
脱式计算,能简算的要简算
9.81×0.1+0.5×98.1+0.049×981 2
÷[(2
﹣1.2)×
+0.05]
100﹣32×0.125×0.25 [1﹣(
﹣
)]×
.
观察下面备题的计算过程和结果,判断是否正确,对的画“√”错的画“×”,并改正过来.
(1)8×
=8=
=72
(2)14.3﹣
=14.3﹣(
)
=14.3﹣9.6
=4.7
(3)
×84+101
=(
)×185
=
=
=39
(4)12.75﹣[6
]
=12.75﹣[6
]
=12.75﹣0
=12.75.
怎样简便怎样算
15×42﹣1308÷2 8.4﹣9.1÷1.3+5.8 4.7×68+53×6.8
2013×
÷8+
÷
+1÷8 7.1﹣0.45×(6.28+3.52)





÷(
+
;
+
+
+
= ;
+
)= ; 4×
+4×
= ;
×(
)= .
= ;
= ;
= .
= ;
= ; 3﹣
﹣
= ;
= ;
= ; 8﹣5.5﹣1.5= .
+4×
×0.6+0.6÷4.
= (
)×30=
×25=
=
÷6=
= 12.5×32×2.5= 5﹣
= 2.8×25+12×2.5=
+4.8﹣
+
)×13×29
×
+
×
﹣
+
+
)×12 ②18.93﹣6
﹣3
﹣0.75×62﹣75% ④7
÷
+1
×2
.
﹣
+
) ②32×1.25×0.25 ③78.9×99+78.9 ④57.2﹣0.4﹣11.6.
②99+992 ③
×25+
×10.
﹣7
= 4
×5
﹣4
×4.375=
64×3.75+3.75×36 25×32×1.25.
÷6+
×
×0.75+
×
(4)4﹣[3.75×(1.2﹣
)+
].
=
=
= 10%+0.9= 7﹣7÷8=
=
=
=
.
= 0.5﹣
=
= 365﹣199=
= 3×
=
=
=




.
)
÷34+
×
.
+1.14+
9
﹣(3.75+4
)
.
)÷0.375 (1﹣12.5%×8)÷(1
.
﹣
﹣
+
(4)
÷(
﹣
×
)
+
= 0.25×40=
×
=
÷
=
﹣
+
= 12×(
+
﹣
)=
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