Tính nhanh:
13) 25 . (75-49) + 75 . /25 - 49/
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25 . (75 - 49) + 75 . (25 - 49)
= 25 . 75 - 25 . 49 + 75 . 25 - 75 . 49
= 1875 - 1225 + 1875 - 3675
= 650 + 1875 - 3675
= 2525 - 3675
= -1150
\(25.\left(75-49\right)+75.\left|25-49\right|\)
\(=25.75-25.49+75.24\)
\(=25.75-25.49+25.3.24\)
\(=25.75-25.49+25.72\)
\(=25.\left(75-49+72\right)\)
\(=25.98\)
\(=2450\)
25.(75+49)-75.(25-49)
=25.124-75.(-24)
=3100-(-1800)
=3100+1800
=4900
HỌC TỐT !!!!
=25.75+25.49-75.25+75.49
=[(25.75)-(75.25)-(25.49)+(75.49)
=0-1225+3675
=2450
a)
\(34.86+68.37\)
\(=34.2.43+68.37\)
\(=68\left(43+37\right)=68.70=4760\)
b)
\(47.25+137.49+47.75-37.49\)
\(=47\left(25+75\right)+49\left(137-37\right)\)
\(=47.100+49.100\)
\(=100\left(47+49\right)\)
\(=100.96\)
=9600
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
7)
53.(51+4)+53.(49+96)+53
=53.55+53.145+53
=53.(55+145+1)
=53.201
=10653
8)
42.(15+96)+6.(25+4).7
=42.111+(6.7).29
=42.111+42.29
=42.(111+29)
=42.140
=5880
9)
45.(13+78)+9.(87+22).5
=45.91+(9.5).109
=45.91+45.109
=45.(91+109)
=45.200
=9000
10)
16.(27+75)+8.(53+25).2
=16.102+(8.2).78
=16.102+16.78
=16.(102+78)
=16.180
=2880
a) A=(135-35).(-47)+53.(-48-52)
= 100.(-47) + 53.(-100)
= 100.(-47) + (-53).100
= 100.(-47+-53)
= 100.(-100)
= -10000
\(=25\cdot75-25\cdot49+75\cdot\left(49-25\right)\)
\(=25\cdot75-25\cdot49+75\cdot49-75\cdot25\)
=49x50=2450