1楼:不明
(1)(1.7+0.8)÷
bai1.25×
du0.8
=2.5÷1.25×zhi0.8
=2×0.8
=1.6;
(dao2)32.55-14.64-6.36+7.45=(32.55+7.45)-(14.64+6.36)=40-21
=19;
(3)(3.72+0.48)÷[(2-0.6)×1.5]=4.2÷[1.4×1.5]
=4.2÷2.1
=2;(4)38×2.8-2.8+2.8×63=(38-1+63)×2.8
=100×2.8
=280;
(5)9.8÷[(19.7-(4.5+2.9)×2]=9.8÷[(19.7-7.4×2]
=9.8÷[(19.7-14.8]
=9.8÷4.9
=2;(6)(25+2.5+1.25)×4=25×4+2.5×4+1.25×4
=100+10+5
=110+5
=115.
脱式计算(能简便的要简便计算) 4.5×5.2+4.5×4.8 8.8×1.25 0.4×(4.3×2.5) 60.8-1.7
2楼:手机用户
(1)4.5×
5.2+4.5×4.8
=4.5×(5.2+4.8)
=4.5×10
=45;
(2)8.8×1.25
=(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
(3)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(4)60.8-1.75-1.25
=60.8-(1.75+1.25)
=60.8-3
=57.8;
(5)0.4×(4.3×2.5)
=4.3×(0.4×2.5)
=4.3×1
=4.3;
(6)45×10.1
=45×(10+0.1)
=45×10+45×0.1
=450+4.5
=454.5;
(7)0.63+0.42+0.37+9.58=(0.63+0.37)+(0.42+9.58)=1+10
=11;
(8)8.36×99+8.36
=8.36×(99+1)
=8.36×100
=836;
(9)0.78×99
=0.78×(100-1)
=0.78×100-0.78×1
=78-0.78
=77.22;
(10)90÷(3.6-1.8)
=90÷1.8
=50;
(11)36÷[(6.1-4.6)×0.8]=36÷[1.5×0.8]
=36÷1.2
=30;
(12)1.6×(2.25+10.5÷1.5)=1.6×(2.25+7)
=1.6×9.25
=14.8;
(13)12.75÷[14.6-(1.3+8.2)]=12.75÷[14.6-9.5]
=12.75÷5.1
=2.5;
(14)3.2+3.91÷(19-16.7)=3.2+3.91÷2.3
=3.2+1.7
=4.9.
脱式计算(能简算的用简便算法).(1)[9.2+0.8×(9-7.75)]÷0.4; (2)3.5×9.8+0.35×2;(3)
3楼:宁负迅昭
(1)[9.2+0.8×(
9-7.75)]÷0.4
=[9.2+0.8×1.25]÷4
=[9.2+1]÷4
=2.55
(2)3.5×9.8+0.35×2
=3.5×(9.8+0.2)
=3.5×10
=35(3)28×26
27=(27+1)×
2627
=27×26
27+26
27=26+26
27=2626
27(4)[(23-3
5)×154+2
3]÷11
12=[1
15×154+2
3]÷11
12=[14+2
3]÷11
12=11
12×12
11=1
脱式计算能用简便计算的要简算.(1)310+4.25+3.7+134(2)0.125×3.2×25(3)17×44+54×17(4)7.8÷
4楼:手机用户
(1)3
10+4.25+3.7+134=3
10+3.7+4.25+13
4=(3
10+3.7)+(4.25+134)
=4+6
=10;
(2)0.125×3.2×25
=0.125×8×0.4×25
=(0.125×8)×版(权0.4×25)=1×10
=10;
(3)1
7×44+54×17=1
7×(44+54)=17
×98=14;
(4)7.8÷〔32×(1-5
8)+3.6〕
=7.8÷〔32×3
8+3.6〕
=7.8÷〔12+3.6〕
=7.8÷15.6
=0.5;
(5)5
6÷〔3
4×(79-1
3)〕=56
÷〔34×49
〕=56÷1
3=2.5.
脱式计算,能简便就简便。 7/27÷4/15x0.32 0.25÷(1-5/8)+3/8?
5楼:乐为人师
脱式计算,能简便就简便。7/27÷4/15×0.32=35/36×0.32
=14/45
0.25÷(1-5/8)+3/8
=1/4÷3/8+3/8
=2/3+3/8
=25/24
6楼:匿名用户
7/27÷4/15×0.32
=7/27×15/4×8/25
=14/45
0.25÷(1-5/8)+3/8
=1/4×8/3+3/8
=2/3+3/8
=(16+9)/24
=25/24
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