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86.24+24.34+120.76
=(86+34).24+120.76
=120.24+120.76
=120.(24+76)
=120.100
=12000
\(a.\)
\(\left(75.68+75.53\right):121\)
\(=\left[75\left(68+53\right):121\right]\)
\(=75.121:121\)
\(=75\)
\(b.\)
\(\left(47.69+47.75\right):141+53\)
\(=\left\{\left[47\left(69+75\right)\right]:141+53\right\}\)
\(=47.144:141+53\)
\(=48+53\)
\(=101\)
\(c.\)
\(\left(77.21-21.34+21.72\right):151-15\)
\(=21\left(77-34+72\right):151-15\)
\(=21.115:151-15\)
\(=\dfrac{2415}{151}-15\)
\(=\dfrac{150}{151}\)
1) \(\left(75.68+75.53\right):121\)
\(=\left[75\left(68+53\right)\right]:121\)
\(=\left(75.121\right):121\)
\(=75\)
2) \(\left(47.69+47.75\right):141+53\)
\(=\left[47\left(69+75\right)\right]:141+53\)
\(=\left(47.144\right):141+53\)
\(=6768:141+53\)
\(=47+53\)
\(=100\)
3) \(\left(77.21-21.34+21.72\right):151-15\)
\(=\left[21\left(77-34+72\right)\right]:151-15\)
\(=\left(21.115\right):151-15\)
\(=2415:151-15\)
\(\approx1\)
khi bỏ dấu ngoặc biểu thức 120+(-8)-(42-57) ta được:
A.120+8-42-57
B.120-8-42-57
C.120-8-42+57
D.120+8-42+57
bài 3 : tính nhanh
a) (42*43+43*57+43)-360:4
ngoặc vuông43.(42+57+1) ngoặc vuông -90
43.100-90
4300-90
4210
b.
a) (42*43 + 43*57 + 43) - 360:4
= 43*(42+57+1) - 90
= 43*100 - 90
= 4300 - 90
= 3410
d) Ta có: \(-8+\left(-14\right)+34+\left(-12\right)\)
\(=-8-14+34-12\)
\(=-20+20\)
\(=-0\)
e) Ta có: \(\left(-7\right)+\left(-20\right)+57+\left(-30\right)\)
\(=\left(-7+57\right)+\left(-20-30\right)\)
\(=50-50=0\)
f) Ta có: \(300-\left(-180\right)-120-42\)
\(=300+180-120-42\)
\(=258+60=318\)
d, Ta có : \(\left(-8\right)+\left(-14\right)+34+\left(-12\right)\)
\(=-\left(8+12\right)+34-14=-20+20=0\)
e, Ta có : \(\left(-7\right)+\left(-20\right)+57+\left(-30\right)\)
\(=-\left(30+20\right)+57-7=-50+50=0\)
f, Ta có : \(300-\left(-180\right)-120-42=318\)
a. 39624 : 312 + (293 - 57) . 73
= 127 + 236 . 73
= 127 + 17228
= 17355
b. 2364 + 183 x 42 : 21 - 1887
= 2364 + 366 - 1887
= 2730 - 1887
= 843
~Study well~
a) 39 624 : 312 + ( 293 - 57 ) . 73
= 127 + 236 . 73
= 127 + 17 228
= 17 355
b) 2364 + 183 . 42 : 21 - 1887
= ( 2364 - 1887 ) + 7686 : 21
= 477 + 366
= 843
=))
176.92
176.92