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a) 29 + 132 + 237 + 868 + 763
= ( 132 + 868 ) + ( 237 + 763 ) + 29
= 1000 + 1000 + 29
= 1000 x 2 + 29
= 2000 + 29
= 2029
b) 35 x 34 + 35 x 38 + 65 x 75 + 45
= 35 x ( 34 + 38 ) + 65 x 75 + 45
= 35 x 72 + 65 x 75 + 45
= 2520 + 4875 + 45
= 2520 + 4920
= 7440
c) 3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12
= ( 3 x 8 ) x 25 + ( 4 x 6 ) x 37 + ( 2 x 12 ) x 38
= 24 x 25 + 24 x 37 + 24 x 38
= 24 x ( 25 + 37 + 38 )
= 24 x 100
= 2400
a)29+132+237+868+763
=(132+868)+(237+763)+29
= 1000 + 1000 +29
= 2029
Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
a, 29 + (132+868)+(237+763)
= 29+1000+1000=2029
b,(652+148)+(327+73) + 15=1215
c,(146+54)+(121+379) = 200+500=700
d,(-452-548)+(395+605)=-1000+1000=0
a)29+132+237+868+763
=161+1105+763
=1266+763
=2029
b)652+327+148+15+73
=979+163+73
=1142+73
=1215
c)146+121+54+379
=267+433
=700
d)(-452)+395+(-548)+605
=(-57)+57
=0
a. 367+129+133+371+17
=(367+133)+(129+371)+17
=500+500+17
=1017
b. 29+132+237+868+763
=29+(132+868)+(237+763)
=29+1000+1000
=2029
c. 652+327+148+15+73
=(652+148)+(327+13)+15
=800+340+15
=1155
a) 367 + 129 + 133 +371 + 17
= ( 367 + 133 ) + ( 129 + 371 ) + 17
= 500 + 500 + 17
= 1017
b) 29 + 132 + 237 + 868 + 763
= ( 132 + 868 ) + ( 763 + 237 ) + 29
= 1000+ 1000 +29
=2029
c) 652 + 327 + 148 + 15 + 73
= ( 652 + 148 ) + ( 327 + 73 ) + 15
= 800 + 400 + 15
=1215
a: 29+131+237+763
=160+1000
=1160
b: 65+327+15+73
=65+15+327+73
=80+400
=480
c: \(12+54:8-8\)
=12+3-8
=15-8
=7
d: \(45\cdot58+45\cdot42\)
\(=45\cdot\left(58+42\right)\)
\(=45\cdot100=4500\)
e: \(35\cdot34+35\cdot26+40\cdot35\)
\(=35\cdot\left(34+26+40\right)\)
\(=35\cdot100=3500\)
f: \(65\cdot25+65\cdot45+30\cdot65\)
\(=65\cdot\left(25+45+30\right)\)
\(=65\cdot100=6500\)
g: \(750:\left\lbrace32-\left\lbrack2^2+\left(5\cdot3^2-42\right)\right\rbrack\right\rbrace+100\)
\(=\frac{750}{32-\left\lbrack4+5\cdot9-42\right\rbrack}+100=\frac{750}{32-4-45+42}+100\)
\(=\frac{750}{28-3}+100\)
=750:25+100
=30+100
=130
h: \(\left\lbrace630:\left\lbrack16+3\cdot\left(6+3\cdot4\right)\right\rbrack\right\rbrace-1\)
\(=\frac{630}{16+3\cdot\left(6+12\right)}-1=\frac{630}{16+3\cdot18}-1\)
\(=\frac{630}{70}-1\)
=9-1=8
i: \(5871:\left\lbrack928-\left(247-82\right)\cdot5\right\rbrack+2175^0\)
\(=\frac{5871}{928-165\cdot5}+1\)
\(=\frac{5871}{928-825}+1=\frac{5871}{103}+1=57+1=58\)
k: \(375:\left\lbrace32-\left\lbrack4+\left(5\cdot3^2-42\right)\right\rbrack\right\rbrace-14\)
\(=\frac{375}{32-\left\lbrack4+5\cdot9-42\right\rbrack}-14\)
\(=\frac{375}{32-\left\lbrack4+45-42\right\rbrack}-14=\frac{375}{32-\left(4+3\right)}-14=\frac{375}{32-7}-14\)
\(=\frac{375}{25}-14\)
=15-14
=1
a, 35.(34+86) + 65.(75+45)
=35.120 + 65.120
=120.(35+65)
=120. 100
=12000
a) 35 * 34 + 35 * 86 + 65 * 75 + 65 * 45
= 35 x ( 34 + 86 ) x 65 x ( 75 + 45 )
= 35 x 120 x 65 x 120
= 120 x ( 35 + 65 )
= 120 x 100
= 12000
a) 35 x 34 + 35 x 86 + 65 x 75 + 65 x 45
= 35 x ( 34 + 86 ) + 65 x ( 75 + 45 )
= 35 x 120 + 65 x 120
= 120 x ( 35 + 65 )
= 120 x 100
= 12 000
- Giải:
a) 29 + ( 132 + 868 ) + ( 237 + 763 )
= 29 + ( 1000 + 1000 )
= 29 + 2000 = 2029
b) 652 + 327 + 148 + 15 + 73
= ( 652 + 148 ) + ( 327 + 73 ) + 15
= ( 800 + 400 ) + 15 = 1215
-------Phần còn lại nhờ mấy bn khác lm hộ nhé-------
a) 29 + 132 + 237 + 868 + 763
= 29 + (132 + 868) + (237 + 763)
= 29 + 1000 + 1000
= 2029
b) 652 + 327 + 148 + 15 + 73
= (652 + 148) + (327 + 73) + 15
= 800 + 400 + 15
= 1215
c) 35 . 24 + 35 . 38 + 65 . 75 + 45 . 65
= 35(24 + 38) + 65(75 + 45)
= 35 . 62 + 65 . 120
= 5 . 7 . 2 . 31 + 65 . 12 . 10
= 10 . 7 . 31 + 65 . 12 .10
= 10(7 . 31 + 65 . 12)
= 10(217 + 780)
= 10 . 997
= 9970
d) 3 . 25 + 4 . 37 . 6 + 2 . 38 . 12
= 3 . 25 + 4 . 37 . 2 . 3 + 2 . 38 . 12
= 3 . 25 + 12 . 37 . 2 + 2 . 38 . 12
= 3 . 25 + 12 . 2(37 + 38)
= 3 . 25 + 12 . 2 . 75
= 3 . 25 + 12 . 2 . 3 . 25
= 3 . 25(1 + 12 . 2)
= 3 . 25 . 25
= 1875
a)29+132+237+868+763
=(132+868)+(237+763)+29
= 1000 + 1000 +29
= 2029
b)652+327+148+15+73
=(652+148)+(327+73)+15
=800+400+15
=1215
c)35x24+35x38+65x75+45x65
=35x(24+38)+65x(75+45)
=35x62+65x120
=2170+7800
=9970
d)3x25+4x37x6+2x38x12
=3x25+24x37+24x38
=3x25+24(37+38)
=75+24x75
=75(1+24)
=75x25
=1875
a, 29 + 132 + 237 + 868 + 763
= 29 + (132 + 868) + (763 + 237)
= 29 + 1000 + 1000
= 2029
b, 652 + 327 + 148 + 15 + 73
= (652 + 148) + (327 + 73) + 15
= 800 + 400 + 15
= 1200 + 15
= 1215
a) (132 + 868) + ( 237 + 763 ) +29
= (1000 + 1000) +29
= 2000 + 29
= 2029
b) Tương tự câu a nhé các bạn
cau a , ={132+868},{237+763}+29
=1000+1000+29
=2000+29
=2029
cau b , ={652+148}+{327+73}+15
=800+400+15
=1200+15
=1215
cau c , =35 . {24+38} + 65 . {75+45}
=2170+7800
=9970
chc các bạn hc giỏi