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a: =34x(-100)=-3400
b: =41(-76-24)=-4100
c: =-24(125-225)=2400
d: =26(-237+137)=-2600
e: =25(-63+23)=25x(-40)=-1000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
SỐ SỐ HẠNG CỦA S LÀ
(1001-21):2+1=491
S LÀ
(1001+21)X491:2=250901
ĐÁP SỐ:250901
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 35.23+35.41+64.65
= 35.(23+41)+64.65
=35.64+64.65
=64.(35+65)
=64.100
=6400
b) 29.87-29.23+64.71
=29.(87-23)+64.71
=29.64+64.71
=64.(29+71)
=64.100
=6400
c) 27.121-87.27+73.34
=27.(121-87)+73.34
=27.34+73.34
=34.(27+73)
=34.100
=3400
\(23\cdot\left(25\cdot127-25\cdot87\right)+87\cdot25\cdot23-23\cdot25\cdot126\)
\(=23\cdot25\left(127-87\right)+23\cdot25\cdot87-23\cdot25\cdot126\)
\(=575\cdot40+575\cdot87-575\cdot126\)
\(=575\left(40+87-126\right)\)
\(=575\cdot1=575\)
23(25.127 - 25.87) + 87.25.23 - 23.25.126
= 23.25.127 - 23.25.87 + 87.25.23 - 23.25.126
= 23. 25.127 + 0 - 23.25.126
=23.25(127-126)
= 23. 25
= 575