\(a,\left(-28\right)-\left(-32\right)\)
\(=\left(-28\right)+32\)
\(=+\left(32-28\right)\)
\(=4\)
\(b,\left(36-16\right).\left(-5\right)+6.\left(-14-6\right)\)
\(=20.\left(-5\right)+6.\left(-20\right)\)
\(=20.\left(-5\right)+\left(-6\right).20\)
\(=20.\left[\left(-5\right)+\left(-6\right)\right]\)
\(=20.\left(-11\right)\)
\(=-220\)
Chúc bạn học tốt nha
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
Bài 1.Tính
a)\(\dfrac{4}{28}\)+\(\dfrac{12}{36}\) b)\(\dfrac{-12}{18}\)+\(\dfrac{15}{-21}\) c)\(\dfrac{14}{28}\)-\(\dfrac{-16}{32}\)-\(\dfrac{17}{51}\)
Tính (36 - 16).(-5) + 6.(-14 - 6), ta được:
(A) -220 (B) -20 (C) 20 (D) 220.
a,(36-16)*(-5)+6*(-14-6)
Câu 19: : Tính (36 - 16).(-5) + 6.(-14 - 6), ta được:
A. - 220 B. 220 C. 20 D. - 20
26.108-26.12/32-28+24-20+16-12+8-4
27.4500+135.550.2/2+4+6+...+14+16+18
Bài 1.
a,-25.72+25.21-49.25
b,35(14-23)-23(14-35)
c,-25.21+25.72+49.25
d,156.72+28*156
e,32.(-39)+16.(-22)
f,184.33+67.184
g,44.(-36)+22.(-28)
Câu 3 : Tính nhanh :
A = 2 - 4 + 6 - 8 + 10 -12 + 14 - 16 + 18 - 20 + 22 - 24 + 26 - 28 + 30 - 32
Bai 3: Ti'nh cac tong sau mot cach hop li
1) (-37) + 14 + 26 + 37
2) (-24) + 6 + 10 + 24
3) 15 + 23 + (-25) + (-23)
4) 60 + 33 + (-50) + (-33)
5) (-12) + (-13) + 36 + (-11)
6) (-16) + 24 + 16 - 34
7) (-16) + (-209) + (-14) + 209
8) 25 + 37 - 48 - 25 - 37
9) 2575 + 37 - 2576 - 29
10) 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17
11) 4573 + 46 - 4573 + 35 - 16 - 5
12) 32 + 34 + 36 + 38 - 10 - 12 - 14 - 16 - 18
Giup mk voi
