b,13+21x5-(198:11-8)
c, 68+42x5-625:25
d,18-4x(27-90+73):10
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12x18+14x3-255:17
=216+42-15
=258-15
=243
68+42x5-625:25
=68+210-25
=278-25
=253
13+21x5-(198/11-8)
=13+105-(18-8)
=13+105-10
=118-10
=108
272:16-5+4x(30-5-255:17)
=17-5+4x(30-5-15)
=17-5+4x(25-15)
=17-5+4x10
=17-5+40
=12+40
=52
25x8-12x5+272:17-8
=200-60+16-8
=140+16-8
=156-8
=148
b) 68 + 42 x 5 - (198 : 11 - 8)
= 68 + 210 - (18 - 8)
= 68 + 210 - 10
= 268
a)12 x 18 + 14 x 3 - 255 : 17=25.58823529411765
b)68 + 42 x 5 - 625 : 25=5182
c) 13+ 21 x 5 - (198 : 11 - 8)=108
d) 1188 - 4 x (27 + 90 + 73 :10 )=
e) 5 + 8 + 11 + 14 +......+ 38 + 41=
f) 51 - 49 + 55 - 53 + 59 - 56 + 63 - 61 + 65=74
có mấy câu mình ko biết,xin lỗi bạn
2,
a) \(315-\left(135-x\right)=215\)
\(\Rightarrow135-x=315-215\)
\(\Rightarrow135-x=100\)
\(\Rightarrow x=135-100\)
\(\Rightarrow x=35\)
b) \(x-320:32=25\cdot16\)
\(\Rightarrow x-10=5^2\cdot4^2\)
\(\Rightarrow x-10=20^2\)
\(\Rightarrow x-10=400\)
\(\Rightarrow x=410\)
c) \(3\cdot x-2018:2=23\)
\(=3\cdot x-1009=23\)
\(\Rightarrow3\cdot x=1032\)
\(\Rightarrow x=1032:3\)
\(\Rightarrow x=344\)
d) \(280-9\cdot x-x=80\)
\(\Rightarrow280-x\cdot\left(9+1\right)=80\)
\(\Rightarrow280-10\cdot x=80\)
\(\Rightarrow10\cdot x=280-80\)
\(\Rightarrow10\cdot x=200\)
\(\Rightarrow x=20\)
e) \(38\cdot x-12\cdot x-x\cdot16=40\)
\(\Rightarrow x\cdot\left(38-12-16\right)=40\)
\(\Rightarrow x\cdot10=40\)
\(\Rightarrow x=40:10\)
\(\Rightarrow x=4\)
2:
a: \(2^2\cdot3-4=4\cdot3-4=12-4=8\)
b: \(16-2^3\cdot2=16-2^4=16-16=0\)
c: \(4^2-4\cdot2=16-8=8\)
d: \(3^3-2\cdot3^2=27-2\cdot9=27-18=9\)
e: \(7^2-9\cdot2^2=49-9\cdot4=49-36=13\)
f: \(2^2\cdot3+4^2=4\cdot3+16=12+16=28\)
Bài 1:
a: \(13+21\cdot5-\left(198:11-8\right)\)
\(=13+105-18+8\)
=21+87
=108
b: \(272:16-5+4\cdot\left(30-5-255:17\right)\)
\(=17-5+4\cdot\left(30-5-15\right)\)
\(=12+4\cdot10=12+40=52\)
c: \(15\cdot24-14\cdot5\cdot\left(145:5-27\right)\)
\(=360-70\left(29-27\right)\)
=360-140
=220
d: \(18\cdot3-18\cdot2+3\cdot\left(\dfrac{51}{17}\right)\)
\(=18\left(3-2\right)+3\cdot3\)
=18+9
=27
e: \(64+115+36-25\cdot8\cdot6\cdot2^2\cdot3+4^2\)
\(=100+115-200\cdot6\cdot4\cdot3+16\)
\(=231-14400=-14169\)
f: \(15\cdot8-\left(17-30+83\right)-144:6\)
\(=120-24-\left(100-30\right)\)
=96-70
=26
=332 x (27 = 73) + 68 x ( 27 + 73)
= 332 x 100 + 68 x 100
= 33200 + 6800
= 4000
Còn câu b, thì hình như sai đề bạn ạ
a,
73.( 8 - 59 ) - 59.( 8 - 73 )
=73.8 -73. 59 - 59.8 - 73.59
=8(73-59)-73(59-59)
=8.14-0
=112
b,Tương tự câu a
c,Tương tự câu a
a) 73 . ( 8 - 59 ) - 59 . ( 8 - 73) b) 159 . ( 18 - 59 ) - 59. ( 18 - 159 ) c) - 145 . ( 13 - 57 ) + 57. ( 10 - 145 )
= 73 . 8 - 73 . 59 - 59 .8 - 59 .73 = 159 . 18 - 159 . 59 - 59 . 18 - 59 . 159 = ( - 145 ) . 13 - (- 145) . 57 + 57 . 10 -57.145
= 8 . ( 72 - 59 ) - 73 . ( 59 - 59 ) = 18 . (159 - 59 ) - ( 59 - 59) - ( 159 - 159) =(-145).13-(-145).57+57.(10-145)
= 8 . 14 - 0 = 1800 - 0 - 0 = (-145).13- (-145).57 + (-135)
= 112 = 1800 = -145.(13 - 57) + (-135)
=6380 + (-135 )
=6245
\(13+21\times5-\left(198:11-8\right)\) \(68+42\times5-625:25\)
\(=13+105-\left(18-8\right)\) \(=68+210-25\)
\(=13+105-10\) \(=278-25\)
\(=118-10\) \(=253\)
\(=108\)