- 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