a) 37.24 + 37.76 + 63.79 + 21.63
b) 101 + (-60) + 29 + (-40)
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
d) (158.129 – 158.39):180
Bài 1 (2 điểm): Thực hiện phép tính
a) 37.24 + 37.76 + 63.79 + 21.63
b) 101 + (-60) + 29 + (-40)
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
d) (158.129 – 158.39):180
dài vậy ngại làm lắm t chỉ làm câu a , b thôi nha
a) 37.24 + 37.76 + 63.79 + 21.63
b) 101 + (-60) + 29 + (-40)
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
d) (158.129 – 158.39):180
giúp mình với ạ
a) 37.24+37.76+63.79+21.63
= 37(24+76)+63(79+21)
= 37.100+63.100
= (37+63)100
= 100.100
= 10000
b) 101+(-60)+29+(-40)
= (101+29)+(-60-40)
= 130-100
= 30
c) 40+(139-172+99)-(139+199-127)
= 40+139-172+99-139-199+127
= (139-139)+(-127+127)+(99-199)+40
= 0+0-100+40
= -60
d) (158.129-158.39):180
= [158(129-39)]:180
= (150.90):180
= 75
=
Bài 1 đề 4
Thực hiện phép tính :
a) 37.24 + 37.76 + 63.79 + 21.63
b) 40 + (139-172+99) - (139+199-172)
Sửa đề
a) 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63.100
= 100.(37 + 63)
= 100.100
= 10000
b) 49 + (139 - 172 + 99) - (139 + 199 - 172)
= 49 + 139 - 172 + 99 - 139 - 199 + 172
= 49 + (139 - 139) + (172 - 172) + (99 - 199)
= 49 + 0 + 0 - 100
= -51
Bài 1 (2 điểm): Thực hiện phép tính
a) 37.24 + 37.76 + 63.79 + 21.63
b) 101 + (-60) + 29 + (-40)
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
d) (158.129 – 158.39):180
g) 101 + (–60) + 29 + (–40)
h) 167 + (–252) + 52 + (–67) i) 38 – 138 + 250 – 350
k) 118 + 107 – (118 – 93) – 50 m) 40 + (139 – 172 + 99) – (139 + 199 – 172)
\(g,101+\left(-60\right)+29+\left(-40\right)=41+29+\left(-40\right)=70+\left(-40\right)=30\)
\(h,167+\left(-252\right)+52+\left(-67\right)=\left(-85\right)+52+\left(-67\right)=\left(-33\right)+\left(-67\right)=-100\)
\(i,38-138+250-350=\left(-100\right)+250-350=150-350=-200\)
\(k,118+107-\left(118-93\right)-50=225-25-50=100-50=50\)
\(m,40+\left(139-172+99\right)-\left(139+199-172\right)=40+\left[\left(-33\right)+99\right]-\left(338-172\right)\)
\(=40+66-166=106-166=-60\)
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
40 + ( 139 – 172 + 99 ) – ( 139 + 199 – 127 )
=40+139-172+99-139-199+127
=(139-139)+(99-199)+(127-172+40)
=0-100+(-45+40)
=-100-5
=-105
c) 40 + (139 – 172 + 99) – (139 + 199 – 127)
40 + ( 139 - 172 + 99 ) - ( 139 + 199 - 127 )
= 40 + 139 + 172 + 99 - 139 - 199 +127
= ( 139 - 139 ) + ( 99 - 199 ) + ( 127 - 172 + 40 )
= 0 -100 - 5
= -105
40+(139-172+99)-(139+199-127)
=40+139-172+99-139-199-127
ĐOẠN NÀY ĐẦU MÌNH CHỊU
40 + ( 139 - 172 + 99 ) - (139 +199 -127 )
\(=40+139-172+99-139-199+127\)
\(=(139-139)+(99-199)+(127-172+40)\)
\(=0-100+(-45+40)\)
\(=-100-5\)
\(=-105\)
\(40+\left(139-172+99\right)-\left(139+199-127\right)\\ =40+66-211\\ =106-211=-105\)
40 + ( 139 - 172 + 99 ) - (139 +199 -127 )
=40+66-211
=106-211
=-105
40+(139-172+99)-(139+199-172)
= 40 + 139 - 172 + 99 -139 - 199 +172
= 40 + (139 -139) + (172 - 172) +( -199+99)
= 40 + 0 + 0 + (-100)
= -60