1樓:小勝k坼
①dao7.8-8.75+2.2-1.25=(版7.8+2.2)權-(8.75+1.25)=10-10
=0②13.2÷(9.4-5)+5.32
=13.2÷4.4+5.32
=3+5.32
=8.32
③7-37-4
7=7-(37+4
7)=7-1
=6④13
17-(5
17+1
10)=1317
-517
-110
=817
-110
=63170⑤15
+(56
-1318)=1
5+(15
18-1318)
=15+19
=1445
計算下面各題,能簡算的要簡算1.25×0.7×0.8 &nb...
2樓:樂事疊合呼
首先要觀察有沒有共同項,有的話就用結合定律,有時候也可以把數拆分來找規律的,回沒有的話一定會有特答俗的運算,比如125x8、25x4等等。一般都是有規律的,還需要平時多多積累。
(1)1.25×0.7×0.8
=(1.25×0.8)×0.7
=1×0.7
=0.7
(2)0.65×202
=0.65×(200+2)
=0.65×200+0.65×2
=130+1.3
=131.3
(3)1.25+4.6+0.75
=(1.25+0.75)+4.6
=2+4.6
=6.6
(4)6.1×3.6+3.6×3.9
=(6.1+3.9)×3.6
=10×3.6
=36(5)16.8÷(7.34-6.54)=16.8÷0.8
=21(6)2.7÷1.25÷8
=2.7÷(1.25×8)
=2.7÷10
=0.27
3樓:匿名使用者
=1 x 0.7
=0.7
(1.25 x 0.8 = 1000 x 0.001)
4樓:手機使用者
(1)1.25×
0.7×0.8
=(du1.25×0.8)zhi×0.7
=1×0.7
=0.7
(2)0.65×202
=0.65×(200+2)
=0.65×200+0.65×2
=130+1.3
=131.3
(3)1.25+4.6+0.75
=(1.25+0.75)+4.6
=2+4.6
=6.6
(4)6.1×3.6+3.6×3.9
=(6.1+3.9)×3.6
=10×3.6
=36(5)16.8÷dao(7.34-6.54)=16.8÷0.8
=21(6)2.7÷1.25÷8
=2.7÷(1.25×8)
=2.7÷10
=0.27
5樓:夜依舊清
1.25*0.7*0.8=1.25*.0.8*0.7=1*0.7=0.7
計算下面各題(能簡算的要簡算)48-2.3×1250×(0.8+0.4)7.34×2.1+7.34×7.8+7.34×1.120.5÷1.25÷0.
6樓:淹了學校
①48-2.3×12,
=48-27.6,
=20.4;
②50×(0.8+0.4),
=50×0.8+50×0.4,
=40+20,
=60;
③7.34×2.1+7.34×7.8+7.34×1.1,=7.34×(2.1+7.8+1.1),
=7.34×10,
=73.4;
④20.5÷1.25÷0.8,
=20.5÷(1.25×0.8),
=20.5÷1,
=20.5;
⑤(8.1-5.4)÷3.6+85.7,
=2.7÷3.6+85.7,
=0.75+85.7,
=86.45;
⑥9.88×9+9.88,
=9.88×(9+1),
=9.88×10,
=98.8.
計算下面各題,能簡算的要簡算。。
7樓:樂為人師
2.5×32×12.5
=(2.5×4)×(8×12.5)
=10×100
=1000
7/9÷11/5+2/9×5/11
=7/9×5/11+2/9×5/11
=(7/9+2/9)×5/11
=1×5/11
=5/11
3/5÷【(1/5+1/3)÷2/9】
=3/5÷【8/15÷2/9】
=3/5÷12/5
=1/4
678-192÷8×12
=678-24×12
=678-288
=390
8×(7/8-5/9)×9
=8×7/8×9-8×5/9×9
=63-40
=232.解方程或解比例。
3/4x+x=1.4
解:1.75x=1.4
x=1.4÷1.75
x=0.8
8樓:瀧穆招高旻
106乘22加78除以13
=106×(20+2)+6
=2120+212+6
=2338
100乘11分之3減3除以11
=100×3/11-3×1/11
=300/11-3/11
=297/11
=27(0.75加2.5)除以0.5加9.8=3.25×2+9.8
=6.5+9.8
=16.3
5分之7乘【(4分之3加3分之1)減14分之13】=7/5×(13/12-13/14)
=7/5×13×(1/12-1/14)
=91/5×1/84
=13/60
計算下面各題,能簡算的要簡算:2000-197,41*102,5分之1/25分之6-7分之2*32分之7,1042-384/16*13,
9樓:匿名使用者
2000-197=2000-(197+3)bai+3=1803(這題先把數字分解du成簡zhi單dao
好算的專數就可以了)屬
41*102=41*(100+2)=4182(這題先把數字分解成簡單好算的數就可以了)
1/5 / 6/25-2/7*2/32=5/6-1/16=37/48(先約分,再通分分母就好算了)
1042-384/16*13=730(簡便就是先把384除以16在簡算)
8.8-6.75+9.2-0.25=(8.8+9.2)-(6.75+0.25)=11(這題盡量把小數換位置加或減成好算的數就簡便)
0.8*3.6-0.8*0.6=0.8*(3.6-0.6)=2.4(這類題,提出相同的數再乘法或加減法)
(7/12+3/8-23/24)*24=(14/24-9/24+23/24)*24=0(這類題,先盡量把分母通分成和乘數一樣的數字就簡算了
4.86*1/(2.1-2.09)=4.86*1/0.01=4.86*1*100/0.01*100=486(先把分數的算了,在給分子分母同時乘以100就簡算)
希望能幫到你,但是要注意學習方法,你掌握的計算的方法就會簡便運算了,祝你學業有成!
10樓:手機使用者
這個要怎麼個算,搞不懂,你是哪個年級的?
計算下面各題,能簡算的要簡算. 8.5×(2.36+2.42)÷0.25 3.9÷1.3×6 4.25×6.3+3.7×4.25 2
11樓:手機使用者
(du1)8.5×
zhi(2.36+2.42)÷0.25,
=8.5×4.78÷0.25,
=40.63÷0.25,
=162.52;
dao(2)3.9÷1.3×6,
=3×6,
=18;
(3)4.25×6.3+3.7×4.25,=4.25×(6.3+3.7),
=4.25×10,
=42.5;
(4)205×99,
=205×(100-1),
=205×100-205×1,
=20500-205,
=20295;
(5)25.6-7.49-2.51,
=25.6-(7.49+2.51),
=25.6-10,
=15.6;
(6)2.5-(6.8-4.9)×0.8,=2.5-1.9×0.8,
=2.5-1.52,
=0.98.
計算下面各題,能簡算的要簡算
12樓:du知道君
2.5×
32×12.5 =(2.5×4)×(8×12.
5) =10×100 =1000 7/9÷11/5+2/9×5/11 =7/9×5/11+2/9×5/11 =(7/9+2/9)×5/11 =1×5/11 =5/11 3/5÷【(1/5+1/3)÷2/9】專 =3/5÷【8/15÷2/9】 =3/5÷12/5 =1/4 678-192÷8×12 =678-24×12 =678-288 =390 8×(7/8-5/9)×9 =8×7/8×9-8×5/9×9 =63-40 =23 2.解方屬程或解比例。 3/4x+x=1.
4 解:1.75x=1.
4 x=1.4÷1.75 x=0.8
計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50
13樓:匿名使用者
(6/35+4/21)÷4/7
=6/35×7/4+4/21×7/4
=3/10+1/3
=9/30+10/30
=19/30
2/9÷2/7÷14/15
=2/9×7/2×15/14
=14/18×15/14
=5/6
(5/6-3/4)÷5/12+4/5
=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5
=2-13/5
=-3/5
3/10÷(4/5-1/2)
=3/10×5/4-3/10×2
=3/8-3/5
=15/40-24/40
=-9/40
2/25÷3/7+23/25÷3/7
=(2/25+23/25)÷3/7
=1×7/3
=2又1/3
8/9÷5/6+1/6
=8/9×6/5+1/6
=16/15+1/6
=32/30+5/30
=37/30
=1又7/30
2/3x=16
x=16×3/2
x=24
3/4x+1/4=3/8
3/4x=3/8-1/4
3/4x=1/8
x=1/8×4/3
x=1/6
1/5x-1/2=3/10
1/5x=1/2+3/10
1/5x=8/10
x=8/10×5x=4
14樓:**防騙
6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30
2/9x7/2x1/14=1/185/6
計算下面各題,能簡算的要簡算 14×75-624÷39(7.6-3.6÷2)×1.545-(45-12)4.68×78+
15樓:奮兒
(1)14×75-624÷39,
=1050-16,
=1034;
(2)(7.6-3.6÷2)×1.5,
=(7.6-1.8)×1.5,
=5.8×1.5,
=8.7;
(3)4
5-(45-1
2),=45
-45+12
,=0+12,
=12;(4)4.68×78+4.68×22,
=4.68×(78+22),
=4.68×100,
=468.
計算下面各題,能簡算的要簡算。,一計算下面各題,能簡算的要簡算。
可以用簡便方法,先把五分之一變成2 10,在與3 10提取1 10.這樣就可以用簡便方法計算了,下面通過 分析這道題。你好,很高興為你解答 1 5 2 9 3 10 1 5 1 3 1 5 1 5 1 1 3 1 5 2 3 2 15 1 5 2 9 3 10 1 5 1 15 3 15 1 15 ...
計算下面各題,能簡算的要簡算。6 5 2
6.5 2.5x4 1 0.65 2 16.44 3 52 下面各題能簡算的要用簡便計算 1 1.36 4.85 2.64 6.15,1.36 2.64 4.85 6.15 4 11,15 2 98.5 2.5 4,98.5 2.5 4 98.5 10,9.85 3 5.4 2.5 3.7 2.9 ...
計算下面各題,能簡算的要簡算6 75 (
解 1 6.75 4.2 1.75 6.75 1.75 4.2,0.8 2 3.5 20.6 16.8 4.8 3.5 20.6 3.5 3.5 17.1,59.85 3 3 4 5 6 2 3 5 4 3 4 1 6 5 4 712 4 5 715 4 48.38 21.63 8.37,48.38...