tính nhanh 75*101-75+25*99+25
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= 75 x (101 -1) + 25 x 99 + 2
= 75 x 100 + 25 x 99 + 2
= 7500 + 25 x 99 + 2
= 7500 + 2475 + 2
= 9975 + 2
= 9977
75 . 101 - 75 + 25 . 99 + 2
= 75 ( 101 - 1 ) + 25 . 99 + 2
= 75 . 100 + 25 . 99 + 2
= 75 . 4 . 25 + 25 . 99 + 2
= 300 . 25 + 25 . 99 + 2
= 25 ( 300 + 99 ) + 2
= 25 . 399 + 2
= 9977
75.101-75+25.99+2=
=75.(101-1)+2475+2
=7500+2477
=9977
tick cho mịnh nha
a, 1 + 2 + 3 + ... + 87
= (1 + 87).87 : 2
= 87.88 : 2
= 87.44
= 3828
b, 2 + 4 + 6 + ... + 54
= (2 + 54).27 : 2
= 27.56 : 2
= 27.28
= 756
c, 3 + 6 + 9 + ... + 99
= (99 + 3).49 : 2
= 49.102 : 2
= 49.51
= 2499
d, 45.25 + 45.75 + 55.25.25 + 55.75
= 45. (25 + 75) + 55(25.25 + 75)
= 45.100 + 55.700
= 4500 + 38500
= 43000
\(d,45x25+45x75+55x25+55x75\)
\(=45x\left(25+75\right)+55x\left(25+75\right)\)
\(=45x100+55x100\)
\(=100x\left(45+55\right)\)
\(=100x100\)
\(=10000\)
a.156*75+25*150
=156*25*3+25*150
=25*(156*3+150)
=25*618
=15450
b,791*101-791
=791*101-791*1
=791*(101-1)
=791*100
=79100
c,2*15*4*25
=(2*15)*(4*25)
=30*100
=3000
\(75.\left(25-52\right)-52.\left(25-75\right)\)
\(=75.25-75.52-52.25+52.75\)
\(=25.\left(75-52\right)\)'
\(=25.23=575\)
75.(25-52)-52.(25-75)
=75.25-75.52-52.25-52.75
=...tự làm đi
= 25 x 25 + 25 x 75 = 25x (25 + 75) = 25 x 100 = 2500
1. (-34)+24+(-7)+27=-10+20=10
2.99+(-100)+101=(99+101)+(-100)=200-100=100
3.(-75)+69+(-25)+131=(69+131)-(75+25)=200-100=100
1) \(\left(-34\right)+24+\left(-7\right)+27\)
\(=-34+24-7+27\)
\(=-\left(34-24\right)-7+27\)
\(=-10-7+27\)
\(=-\left(10+7\right)+27\)
\(=-17+27\)
\(=27-17\)
\(=10\)
2) \(99+\left(-100\right)+101\)
\(=99-100+101\)
\(=-100+99+101\)
\(=-\left(100-99\right)+101\)
\(=-1+101\)
\(=101-1\)
\(=100\)
3) \(\left(-75\right)+69+\left(-25\right)+131\)
\(=-75+69-25+131\)
\(=-\left(75-69\right)-25+131\)
\(=-6-25+131\)
\(=-\left(6+25\right)+131\)
\(=-31+131\)
\(=131-31\)
\(=100\)
25 . (75 - 49) + 75 . (25 - 49)
= 25 . 75 - 25 . 49 + 75 . 25 - 75 . 49
= 1875 - 1225 + 1875 - 3675
= 650 + 1875 - 3675
= 2525 - 3675
= -1150
( - 25 ) . ( 75 - 45 ) - 75 . ( 45 - 25 )
= ( - 25 ) . 75 - ( - 25 ) . 45 - 75 . 45 - ( - 75 ) . 25
= ( - 25 ) . 45 - 75 . 45
= [ ( - 25 ) + 75 ] . 45
= 50 . 45
= 2250
`75 xx 101 - 75 + 25 xx 99 + 25`
`= 75 xx 101 - 75 xx 1 + 25 xx 99 + 25 xx 1`
`= 75 xx (101 - 1) + 25 xx (99 + 1) `
`= 75 xx 100 + 25 xx 100`
`= 100 xx (75+25) `
`= 100 xx 100`
`=10000`