1樓:手機使用者
(1)3.5×0.8+7.5×0.8-80%,=(3.5+7.5-1)×0.8,
=10×0.8,
=8;(2)1 5
÷3+4 5
×1 3
,=(1 5
+4 5
)×1 3
,=1×1 3
,=1 3
;(3)20-(3.84+1.21)×0.4,=20-5.05×0.4,
=20-2.02,
=17.98;
(4)35÷[(11 6
-2 3
)×6].
=35÷[7 6
× 6],
=35÷7,=5.
-、脫式計算。(能簡便的簡便) (1)3.6×5÷3.6×5 二、解決問題。 (1)一間教室的面積 20
2樓:匿名使用者
(1)3.6×5÷3.6×5=25
87.04÷0.4²=544
9÷4.5=2小時 4.5÷9=0.5公頃18-21.6×18÷24.3=2
3.5×(0.32÷0.4)=2.8
(8.1+4.5)÷(7.52-1.5)=
3樓:匿名使用者
6.25÷1%-1.25×25×8
=625-(1.25×8)×25
=625-10×25
=625-250
=375
3/5×81+60%×19
=0.6×(81+19)
=0.6×100
=604/3×4÷4×4/3
=4/3×4/3×(4÷4)
=4/3×4/3
=16/9
13/7×12.5%+12.5%×13/6=(13/7+13/6)×12.5%
=1×12.5%
=0.125
5/4×3.5+5.5×80%+0.8
=0.8×(3.5+5.5+1)
=0.8×10
=8(27+19/18)÷9
=27÷9+19/18÷9
=3+19/2
=3又19/2
81/5×3.6÷1又6/1
=9/2÷7/6
=9/2×6/7
=27/7
4樓:建小之
25沒有長寬尺寸怎麼算
每公頃兩小時,每小時半公頃
脫式計算(能簡算的要用簡便方法計算): ①80÷(1-84%) ②5-5× 2 5 +
5樓:臥牛
①80÷(1-84%),
=80÷0.16,
=500;
②5-5×2 5
+3 5
,=5-2+3 5
,=33 5
;③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;④7 9
÷11 5
+2 9
×511
,=7 9
×511
+2 9
×511
,=(7 9
+2 9
)×511
,=1×5
11,=511.
6樓:冼棟屈嘉穎
解:①80÷(1-84%),
=80÷0.16,
=500;
②5-5×
25+35,
=5-2+35,
=335;
③0.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;④79÷115+29×511,
=79×511+29×511,
=(79+29)×511,
=1×511,
=511.
脫式計算,能簡算的要簡算,脫式計算能簡算的,要簡算25加13乘以1589乘
原式 5 9 5 9 3 8 3 8 1 3 8 3 8 9 64 1 8 5 9 3 8 2 9脫式計算過程。1 8 5 9 3 8 2 9脫式計算過程。1 8 3 8 5 9 2 9 1 4 7 9 9 36 28 36 37 36 1 8 3 8 5 9 2 9 4 8 7 9 1 2 7 9...
脫式計算(能簡算的要簡算),脫式計算 (能簡算的要簡算)1840 725 25 16
1 1840 725 25 16,1840 29 16,1840 30 1 16,1840 30 16 16,1360 16,1376 2 278?8 17?917,278 817 917 27 8?1,198 238 3 16.4 3.5 83.6 166.5,16.4 83.6 3.5 166....
脫式計算能簡算的要簡算
1 1.8 2.58 0.5 1.42 1.8 1.8 2.58 1.42 0.5 1.8 4 0.5 7.2 0.5 7.7 2 54.7 17.5 0.45 0.9 37.2 0.5 18.6 3 1.5 0.1 0.2 0.18 0.36 1.5 0.5 0.5 0.75 0.5 0.25 4...