1樓:手機使用者
(1)22.3-2.45-5.3-4.55,=(22.3-5.3)-(2.45+4.55),=17-7,
=10;
(2)9
20÷[1
2×(25+1
3)],
=920
÷[12
×1115
],=9
20÷1130,
=2722
;(3)[43.3×(2-75%)+7]×12,=[43.3×1.25+7]×12,
=[54.125+7]×12,
=61.125×12,
=30.5625;
(4)9
20×103?9
20×3,
=920
×(103?3),
=920
×100,
=45;
(5)5
9÷5+4
9÷4,=19
+19,=2
9;(6)12?6
13÷9
26?23,
=12-43-2
3,=12-(43+2
3),=12-2,
=10.
脫式計算:(能簡算的要寫簡算過程)13.7×0.25×8;[12.7-(7.25+4.5)]×5.2;7
2樓:
(1)13.7×0.25×8
=13.7×(0.25×8)
=13.7×2
=27.4;
(2)[12.7-(7.25+4.5)]×5.2=[12.7-11.75]×5.2
=0.95×5.2
=4.94;
(3)799×99
=799×(100-1)
=799×100-799
=79900-(800-1)
=79900-800+1
=79101.
(4)1.6×(2.25+27.75÷1.5)=1.6×(2.25+18.5)
=1.6×20.75
=33.2.
計算下面各題,能簡便的要用簡便方法計算21÷(13+25)÷911920÷[12×(45+25)]5.65-6.29+5.35-2.713.7×99
3樓:桓廣英
(1)21÷(13+2
5)÷9
11=21÷11
15÷9
11=21÷(11
15×911)
=21÷3
5=35;
(2)9
20÷[1
2×(45+2
5)]=920
÷[12×65
]=920÷35=3
4;(3)5.65-6.29+5.35-2.71=(5.65+5.35)-(6.29+2.71)=11-9
=2;(4)3.7×99+3.7
=3.7×(99+1)
=3.7×100
=370.
遞等式計算.3×12-33.46÷0.35 12.74-0.125+2.26-9.875 0.25×3.2×1.25 5×13×0.4 89÷[(25
4樓:夏妹紙
3×12-33.46÷0.35
=36-95.6
=-59.6
12.74-0.125+2.26-9.875=(12.74+2.26)-(0.125+9.875)=15-10
=50.25×3.2×1.25
=0.25×(4×0.8)×1.25
=(0.25×4)×(0.8×1.25)
=1×1
=15×13×0.4
=5×0.4×13
=2×13
=2689÷[(25+110 )×34]
=89÷(135×34)
=89÷4590
≈0.02
45+45×19
=45×(1+19)
=45×20
=900
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