1樓:手機使用者
(du1)15.64-2.53-7.47
=15.64-(2.53+7.47),zhi=15.64-10,
=5.64;
(2)3.7+6.3÷0.6-0.4
=3.7+10.5-0.4,
=13.8;
(3)3.5÷[(0.45-0.38)×0.1]=3.5÷[0.07×0.1],
=3.5÷0.007,
=500;
(4)5.6×7.2+4.4×7.2
=(5.6+4.4)×7.2,
=10×7.2,
=72.dao
3.4×1.5+7.2÷0.6用簡便方式計算,怎麼計算?
2樓:妙酒
3.4×1.5+7.2÷0.6
=5.1+72÷0.6
=5.1+12
=17.1
能簡便的用簡便方法計算.6.5÷5+3.5×0.5 7.85÷0.25÷0.4 15....
3樓:手機使用者
(1)6.5÷5+3.5×0.5
=1.3+1.75
=3.05
(2)7.85÷0.25÷0.4
=7.85÷(0.25×0.4)
=7.85÷0.1
=78.5
(3)15.64-2.53-7.47
=15.64-(2.53+7.47)
=15.64-10
=5.64
(4)36+61.2÷12
=36+5.1
=41.1
(5)0.25×(4+0.8)
=0.25×4+0.8×0.25
=1+0.2
=1.2
(6)7.8÷2.6-0.05×0.02
=3-0.001
=2.999
4樓:開萱由琬
小數點後都是0.25
小數點前的規律是
0=0×(0+1)
12=3×(3+1)
42=6×(6+1)
不懂請追問,望採納,謝謝~
用遞等式的格式計算(能簡算的可以用簡便方法計算)7.2÷1.8+6.8×0.53.7+6.3÷0.6-0.43.5÷〔(0.45-0.3
5樓:百度使用者
(1)7.2÷1.8+6.8×0.5,
=4+3.4,
=7.4;
(2)3.7+6.3÷0.6-0.4,
=3.7+10.5-0.4,
=14.2-0.4,
=13.8;
(3)3.5÷[(0.45-0.38)×0.1],=3.5÷(0.07×0.1),
=3.5÷0.007,
=500;
(4)5.6×7.2+4.4×7.2,
=(5.6+4.4)×7.2,
=10×7.2,
=72.
用簡便方法計算.(要求寫出簡便過程) 15.3-7.28+4.7-2.72 (24+ 6 7 )÷6 7
6樓:嬤嬤
(1)15.3-7.28+4.7-2.72,=15.3+4.7-(7.28+2.72),=20-10,
=10;
(2)(24+6 7
)÷6,
=24×1 6
+6 7
×1 6
,=4+1 7
,=41 7
;(3)7 9
×5 11
+7 9
÷11 6
,=7 9
× (5
11+6 11
),=7 9
×1 ,
=7 9.
計算下面各題,能用簡便方法的就用簡便方法計算.(1)15.52-1.6×5-5.7 ...
7樓:手機使用者
(復1)15.52-1.6×5-5.7,
制=15.52-8-5.7,bai
=7.52-5.7,
=1.82;
du(2)9.83×1.5+6.17×1.5,=1.5×(zhi9.83+6.17),
=1.5×16,
=1.5×2×8,
=24;
(3)19.8-0.6×0.6-0.64,=19.8-0.36-0.64,
=19.8-(0.36+0.64),
=19.8-1,
=18.8;
(4)0.125×7.9×8,
=0.125×8×7.9,
=1×7.9,
=7.9;
(5)63×10.1,
=63×(10+0.1),
=63×10+63×0.1,
=630+6.3,
=636.3;
(6)21.5÷[(6.07+2.53)×dao0.5],=21.5÷[8.6×0.5],
=21.5÷[0.5×2×4.3]
=21.5÷4.3,=5.
用遞等式計算,寫出必要的計算過程,能簡便運算的要用簡便方法計算.100-870÷29-8815÷7.5+4.6-6.63.5×
8樓:桃兒
①100-870÷
29-88
=100-30-88
=-18
②15÷7.5+4.6-6.6
=2+4.6-6.6
=6.6-6.6
=0③3.5×
64×12.5
=(3.5×8)×內(8×12.5)
=28×100
=2800
④容51×7.5-49×7.5-1
=(51-49)×7.5-1
=2×7.5-1
=15-1
=14⑤4×(4.8+3.2÷4-5.6)=4×(4.8+0.8-5.6)
=4×0
=0⑥[8+(5-2)÷1.2]×5
=[8+3÷1.2]×5
=10.5×5
=52.5
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