Tôi đố bạn. 69-31. 56+12. 59-31. 16+12 bằng bao nhiêu
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a: \(\left(36-16\right)\cdot\left(-15\right)+16\cdot\left(-14-6\right)\)
\(=-15\cdot20+16\cdot\left(-20\right)=-20\cdot\left(-15+16\right)=-20\)
b: \(\left(-47\right)\cdot\left(-69\right)-\left(-31\right)\cdot47\)
\(=47\cdot69+31\cdot47\)
\(=47\cdot100=4700\)
c: \(38\cdot\left(-41\right)+59\cdot\left(-38\right)\)
\(=38\left(-41-59\right)\)
\(=-100\cdot38=-3800\)
a)
\(\left(-11\right).\left(-28\right)+\left(-9\right).13\)
\(=308+\left(-9\right).13\)
\(=308+\left(-117\right)\)
\(=191\)
b)
\(\left(-69\right).\left(-31\right)-\left(-15\right).12\)
\(=\left(-69\right).\left(-31\right)+15.12\)
\(=2139+15.12\)
\(=2139+180\)
\(=2319\)
c)
\(\left[16-\left(-5\right)\right].\left(-7\right)\)
\(=\left[16+5\right].\left(-7\right)\)
\(=21.\left(-7\right)\)
\(=-147\)
d)
\(\left[\left(-4\right).\left(-9\right)-6\right].\left[\left(-12\right)-\left(-7\right)\right]\)
\(=\left[\left(-4\right).\left(-9\right)-6\right].\left[\left(-12\right)+7\right]\)
\(=\left[36-6\right].\left[\left(-12\right)+7\right]\)
\(=30.\left[\left(-12\right)+7\right]\)
\(=30.\left(-5\right)\)
\(=-150\)
\(17\times109-17\times53+56\times96-13\times56\)
\(=17\times\left(109-53\right)+56\times\left(96-13\right)\)
\(=17\times56+56\times83\)
\(=56\times\left(17+83\right)\)
\(=56\times100\)
\(=5600\)
\(8\times27\times3+2\times31\times12+6\times12\times4\)
\(=24\times27+24\times31+24\times12\)
\(=24\times\left(27+31+12\right)\)
\(=24\times70\)
\(=1680\)
\(15\times47+15\times33+60\times39+60\times41\)
\(=15\times\left(47+33\right)+60\times\left(39+41\right)\)
\(=15\times80+60\times80\)
\(=80\times\left(15+60\right)\)
\(=80\times75\)
\(=6000\)
\(97\times59-59\times31-66\times49\)
\(=59\times\left(97-31\right)-66\times49\)
\(=59\times66-66\times49\)
\(=66\times\left(59-49\right)\)
\(=66\times10\)
\(=660\)
Học tốt
2 . 53 . 27 + 6 . 9 . 87 - 3 . 18 . 40
= 2. 53 . 9 . 3 + 2. 3 .9 .87 - 3 .2 .9 .40
= 54.53+54.87-54.40
=54(53+87-40)
=54. 100=5400
12 . 25 + 29 . 25 + 59 . 25
= 25 . ( 12+29+59)
=25 . 90
=2250
43 . 37 + 93 . 43 + 57 . 61 + 69 . 57
= 43.(37+93)+57(61+69)
=43.130+57.130
=130.(43+57)
=130.100
=13 000
12 . 53 + 53 . 172 - 53
=53(12+172-1)
=53.184
=9752
35 . 54 + 35 . 58 + 65 . 75 + 65 . 45
=35(54+58)+65(75+45)
=35.112+65.120
=3920+7800
=11720
39 . 8 + 70 . 3 + 31 . 8
=8(39+31)+70.3
=8.70+70.3
=70.(8+3)
=70.11
=770
a ) x + 36 =98
x = 98 -36
x = 62
x * 8 = 56
x = 56 : 8
x = 7
b ) 16 + 32 = 48
39 + 25 = 64
c) tính nhanh :
36 + 69 + 31 + 64
= ( 36 + 64 ) + ( 69 + 31 )
= 100 + 100
= 200
12 + 78 + 25 + 75
= (12 + 78 ) + ( 25 + 75 )
= 90 + 100
= 190
Bạn kiểm tra lại giùm mình đi nha:
15.37.4+120.21+21.5.12 16.64+76.34
=15.37.4+(6.7).4.(5.3)+(3.5).(7.3).4 =
=15.37.4+42.4.15+15.21.4
=15.4.(37+42+21)
=60.100
=6000
-1463 nhé