tính :
-190 – x = -119 − (− 219 – 300)
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219-(x+1)=199
x+1 = 219 - 199
x+1 = 100
x = 100 - 1
x = 99
Vậy x = 99
a,
A=\(\left(2^9.16+2^8.24\right):2^{11}\)
A=\(\left(2^8.2.16+2^8.24\right):2^{11}\)
A=\(\left(2^8.32+2^8.24\right):2^{11}\)
A=\(\left[2^8.\left(32+24\right)\right]:2^{11}\)
A=\(\left(2^8.56\right):2^{11}\)
A=\(\left(2^8.8.7\right):2^{11}\)
A=\(\left(2^8.2^3.7\right):2^{11}\)
A=\(\left(2^{8+3}.7\right):2^{11}\)
A=\(\left(2^{11}.7\right):2^{11}\)
A=\(2^{11}.7:2^{11}\)
A=\(\left(2^{11}:2^{11}\right).7\)
A=\(1.7\)
A=\(7\)
\(a.\left[\left(-8\right)+\left(-7\right)\right]+\left(-10\right)=\left(-15\right)+\left(-10\right)=-25\)
\(b.555-\left(-333\right)-100-80=\left(555+333\right)-\left(100+80\right)=888-180=708\)
\(c.-\left(-229\right)+\left(-219\right)-401+12=\left(229-219\right)-\left(401-12\right)=10-389=-379\)
\(d.300-\left(-200\right)-\left(-120\right)+1=\left(300+200\right)+\left(120+1\right)=500+121=621\)
Trl:
d) \(555-\left(-33\right)-100-80\)
\(=588-20\)
\(=568\)
e) \(-\left(-229\right)+\left(-219\right)-401+12\)
\(=10-413\)
\(=403\)
f) \(300-\left(-200\right)-\left(-120\right)+18\)
\(=500-\left(-102\right)\)
\(=602\)
Hc tốt
8 + ( - 7 ) + ( - 10 ) = - 9
229 + 219 + 401 - 12 = 837
300 + 200 + 120 + 18 = 638
a)\(27.65+27.35+300=27.\left(65+35\right)+300\)
\(=27.100+300=2700+300=3000\)
b)\(3838:\left[\left(190-6.5^2\right):4+3\right]\)
\(=3838:\left[\left(190-6.25\right):4+3\right]\)
\(=3838:\left[\left(190-150\right):4+3\right]\)
\(=3838:\left[40:4+3\right]=3838:\left[10+3\right]\)
\(=3838:13=\dfrac{3838}{13}\)
c)\(2022-x=2021\)
\(x=2022-2021=1\)
d)\(26+14:\left(x-5\right)=33\)
\(14:\left(x-5\right)=33-26=7\)
\(x-5=14+7=2\)
\(x=2+5=7\)
e)đề hỏi làm j thế bạn
\(\left(-8\right)+\left(-7\right)+\left(-10\right)\)
\(=-8-7-10\)
\(=-15-10=-25\)
\(\left(-229\right)+219-401+12\)
\(=\left(219-229\right)-401+12\)
\(=-10-401+12\)
\(=-399\)
\(555-\left(-333\right)-100-80\)
\(=555+333-100-80\)
\(=888-100-80\)
\(=780-80=700\)
\(300-\left(-200\right)-\left(-120\right)+18\)
\(=300+200+120+18\)
\(=500+120+18\)
\(=620+18\)
\(=638\)
x=-590
-190 - x= -119 + 219 + 300
-190-x = 400
-x = 400 + 190
-x = 590
=> x = -590
Vậy...