1樓:匿名使用者
0.56÷
zhi3.5=(
dao0.8*7)
內/(0.5*7)=8/5
5.4÷3.6-0.7=(1.8*3)/(1.8*2)-0.7=1.5-0.7=0.8
(17.6+0.96)÷
容0.8 =17.6/0.8+0.96/0.8=22+1.2=23.2
2樓:匿名使用者
0.56÷3.5=0.7*0.8÷(0.5*0.7)
5.4÷3.6-0.7 =0.9*(6-4)-0.7
(17.6+0.96)÷0.8 =(22+12)*0.8÷0.8
3樓:長江結寒冰
(1)0.56÷bai3.5
= ( 0.56÷7)÷(3.5÷7)……被除du數和除數同zhi時縮小7倍,商dao不變。
= 0.08 ÷ 0.5
=( 0.08 ×回2)÷( 0.5×2)……使答除數為1= 0.16÷1
=0.16
(2) 5.4÷3.6-0.7
=( 5.4÷9)÷(3.6÷9)-0.7=0.6÷0.4-0.7
=1.5-0.7
=0.8
(3)(17.6+0.96)÷0.8
=17.6÷0.8 + 0.96÷0.8……除法的性質=2.2 + 0.12
=2.32
(8.1-5.4)÷3.6+85.7怎樣簡便計算
4樓:淡風燃塵
除法那部分先提取公因式
(8.1-5.4)÷3.
6 = (0.9 x 9 - 0.9 x 6)÷ (0.
9 x 4)= 0.9 x (9 - 6) ÷ (0.9 x 4)= 0.
9 x (9 - 6) ÷ 0.9 ÷ 4= (9 - 6) ÷ 4= 0.75 (8.
1-5.4)÷3.6+85.
7= 0.75 + 85.7= 85 + 0.
7 + 0.75= 85 + (0.7 + 0.
75)= 85 + 1.45= 86.45
能簡算的要用簡便方法計算24.1×1.5+7.59×15(3.7+17×0.4)÷3.575.36÷12-4.32×0.58.8×0.125 7.6×5
5樓:那朵花
①24.1×
1.5+7.59×15,
=2.41×15+7.59×15,
=(2.41+7.59)×15,
=10×15,
=150;
②(3.7+17×0.4)÷3.5,
=(3.7+6.8)÷3.5,
=10.5÷3.5,
=3;③75.36÷12-4.32×0.5,=6.28-2.16,
=4.12;
④8.8×0.125,
=(8+0.8)×0.125,
=8×0.125+0.8×0.125,
=1+0.1,
=1.1;
⑤7.6×5.3+3.7×7.6,
=(5.3+3.7)×7.6,
=9×7.6,
=68.4;
⑥6.6÷(0.68+0.42),
=6.6÷1.1,=6.
3.5×(2.4+5.4÷0.6)用簡便方法計算?
6樓:第一題選
這個題目沒有辦法用簡便方法運算哦!
3.5×(2.4+9)
=39.9
7樓:匿名使用者
3.5×(2.4+5.4÷0.6)
=3.5×(2.4+9)
=3.5×11.4
=3.5×2×5.7
=7×5.7
=39.9
(3.2+0.56)÷0.8簡便運算怎麼算?
8樓:簡胖子我也
(3.2+0.56)÷0.8
=3.2÷0.8+0.56÷0.8
=4+0.7
=4.7
簡便計算是一種特殊的計算,它運用了運算定律與數字的基本性質,從而使計算簡便,使乙個很複雜的式子變得很容易計算出得數。
在數的運算中,有加(+)、減(-)、乘(×)、除(÷)四種運算,我們在數學上又為了能更 簡便計算它們,簡稱稱作簡算,簡算有以下幾種公式:
加法:a+b=b+a( 加法交換律)
a+b+c=a+(b+c)( 加法結合律)
乘法:a×b=b×a( 乘法交換律)
a×b×c=a×(b×c)( 乘法結合律)
(a+b)×c=a×c+b×c或(a-b)×c=a×c-b×c( 乘法分配律)
減法:a-b-c=a-(b+c)(減法的基本性質)
除法:a÷b÷c=a÷(b×c)(除法的基本性質)
重疊數字多位數:abab=ab×101
(a+b)÷c=(a÷c)+(b÷c)或(a-b)÷c=a÷c-b÷c(除法分配律)注意除法分配率只有在 被除數是兩個數的差或和的 情況下才能進行 分配。
50道簡便計算題及答案
9樓:匿名使用者
????????????????????????????????????????????
10樓:匿名使用者
你的第乙個題錯了吧!
11樓:匿名使用者
應該這樣( ˙-˙ )
12樓:雪天裡的風是刀
山jj超級錦鯉觸控螢幕
13樓:匿名使用者
歐了吳翠本土烤魚拉動
14樓:贊成利利
蠟筆賤人就是矯情利人利己拆
15樓:匿名使用者
望採納謝謝。(1)2.5*32*0.125
=(2.5*4)*(8*0.125)
=10*1
=10(2)3.5-7+6.5
=3.5+6.5-7
=3(3)1.2×2.5+0.8×2.5
=2.5(1.2+0.8)
=25(4)8.9×1.25-0.9×1.25
=1.25(8.9-0.9)
=10(5)12.5×7.4×0.8
=12.5×0.8×7.4
=74(6)6.5×9.5+6.5×0.5
=6.5×(
e5a48de588b662616964757a686964616f313333633731389.5+0.5)
=6.5×10
=65(7)0.35×1.6+0.35×3.4
=0.35*(1.6+3.4)
=0.35*5
=1.75
(8)6.72-3.28-1.72
=6.75-(3.28+1.72)
=6.75-5
=1.75
(9)0.45+6.37+4.55
=0.45+4.55+6.37
=5+6.37
=11.37
(10)28×12.5-12.5×20
=(28-20)*12.5
=8*12.5
=100
(11)23.65-(3.07+3.65)
=23.65-3.65-3.07
=20-3.07
=16.93
(12)(4+0.4×0.25)8×7×1.25
=(4+1)*7*10
=5*7*10
=350
(13)1.65×99+1.65
=1.65*(99+1)
=1.65*100
=165
(14)27.85-(7.85+3.4)
=27.85-7.85+3.4
=20+3.4
=23.4
(15)48×1.25+50×1.25×0.2×8
7.8×9.9+0.78
=7.8*(9.9+0.1)
=7.8*10
=78(16)4.8×46+4.8×54
=(46+54)*4.8
=100*4.8
=480
(17)673-327-173
=673-(327+173)
=673-500
=173
(18)4.44*2.5
=1.11*(4*2.5)
=1.11*10
=11.1
(19)3.5÷1.4
=(3.5÷0.7)÷(1.4÷0.7)
=5÷2
=2.5
(20)1+2+3+4+5......+99+100
=(1+99)+(2+98)+(3+97)+......+(49+51)+50
=(100÷2-1)*100+50
=4900+50
=4950⑴運用加法交換律進行簡便計算。
0.88+5.6+0.12 1.78+3.5+0.22 5.6+2.08+14.4
=0.88+0.12+5.6 =1.78+0.22+3.5 =5.6+14.4+2.08
=1+5.6 =2+3.5 =20+2.08
=6.6 =5.5 =22.08
⑵運用加法結合律進行簡便計算
2.3+(0.56+4.7) 28.6+0.54+0.46+1.4 5.82+4.56+5.44
=(2.3+4.7)+0.56 =(28.6+1.4)+(0.54+0.46) =5.82+(4.56+5.44)
=7+0.56 =30+1 =5.82+10
=7.56 =31 =15.82
⑶、運用乘法交換律進行簡便計算。
25×0.37×0.4 7.5×0.39×4 6.5×1.1×4 1.25×3.9×0.8
=25×0.4×0.37 =7.5×4×0.39 =6.5×4×1.1 =1.25×0.8×3.9
=10×0.37 =30×0.39 =26×1.1 =1×3.9
=3.7 =11.7 =28.6 =3.9
⑷、運用乘法結合律進行簡便計算。
1.9×7.5×8 6.2×0.8×2.5 4.3×1.5×6 4.1×3.5×2
=1.9×(7.5×8) =6.2×(0.8×2.5) =4.3×(1.5×6) =4.1×(3.5×2)
=1.9×60 =6.2×2 =4.3×9 =4.1×7
=114 =12.4 =38.7 =28.7
⑸、運用乘法分配律的加法進行簡算。
13.6×4.6+4.6×6.4 0.72×23+77×0.72 2.6×32+32×2.4
=(13.6+6.4)×4.6 =(23+77)×0.72 =(2.6+2.4) ×32
=20×6.4 =100×0.72 =5×32
=128 =72 =160
⑹、運用乘法分配律的減法進行簡算。
12×5.9-5.9×2 4.6×2.5-2.5×0.6 101×9.7-9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=(12-2) ×5.9 =(4.6-0.6)×2.5 =(101-1)×9.7
=10×5.9 =4×2.5 =100×9.7
=59 =10 =970
⑺、運用減法的運算規律進行簡便計算。
1.8-0.45-0.55 54.4-4.6-5.4 35.6-0.13-0.47
=1.8-(0.45+0.55) =54.4-(4.6+5.4) =35.6-(0.13+0.47)
=1.8-1 =54.4-10 =35.6-0.6
=0.8 =44.4 =35
⑻、運用除法的運算規律進行簡便計算。
4.5÷4÷7.5 14.8÷1.25÷8 18.5÷4÷1.25 5.4÷4÷0.45
=4.5÷(4×7.5) =14.8÷(1.25×8) =18.5÷(4×1.25) =5.4÷(4×0.45)
=4.5÷30 =14.8÷10 =18.5÷5 =5.4÷0.18
=0.15 =1.48 =3.7 =30
⑼綜合運用各種運算定律進行簡算。
2.54+2.46+0.44+0.54 10.7×0.4-6.7×0.4 0.5×3.2×1.25
=(2.54+2.46)+(0.44+0.54) =(10.7-6.7)×0.4 =(0.5×4)×(0.8×1.25)
=5+1 =4×0.4 =2×1
=6 =1.6 =2
89.7+5.8-9.7+4.2 99×0.38+0.38 360÷(18×0.4)
=(89.7-9.7)+(5.8+4.2) =(99+1) ×0.38 =360÷18÷0.4
=80+10 =100×0.38 =20÷0. 4
=90 =38 =50
4.8×12.5 2.5×1.6×12.5 3.2×102
=0.6×(8×12.5) =(2.5×0.2)×(8×12.5) =3.2×(100+2)
=0.6×100 =0.5×100 =3.2×100+3.2×2
=60 =50 =320+6.4
=326.4
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