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Giải câu b:
92.4 - 27 = \(\frac{a+350}{a}\)+ 315
368 - 27 = \(\frac{a+350}{a}\)+ 315
341 = \(\frac{a+350}{a}\)+ 315
\(\frac{a+350}{a}\)= 341 - 315
\(\frac{a+350}{a}\)= 26
a + 350 = 26.a
26a - a = 350
(26 - 1).a = 350
25.a = 350
a = 350 : 25
a = 14
tịt???????????????????????????????????????___________________????????????????????????????????????????????????
a.\(697:\frac{15.a+364}{a}=17\)
\(\Leftrightarrow\frac{15.a+364}{a}=41\)
\(\Leftrightarrow15.a+364=41.a\)
\(\Leftrightarrow15.a-41.a=-364\)
\(\Leftrightarrow a.\left(15-41\right)=-364\)
\(\Leftrightarrow a.\left(-26\right)=-364\)
\(\Leftrightarrow a=14\)
b.\(92.4-27=\frac{a+350}{a}+315\)
\(\Leftrightarrow368-27=\frac{a+350}{a}+315\)
\(\Leftrightarrow\frac{a+350}{a}+315=341\)
\(\Leftrightarrow\frac{a+350}{a}=26\)
\(\Leftrightarrow a+350=a.26\)
\(\Leftrightarrow350=a.26-a\)
\(\Leftrightarrow a.\left(26-1\right)=350\)
\(\Leftrightarrow a.25=350\)
\(\Leftrightarrow a=14\)
1990.1990-1992.1998
=1990.1990-(1990+2).1998
=1990.1990-1990.1998+2.1998
=1990.(1990-1998)+2.1998
=1990.(-8)+2.1998
=1990.(-8)+2.(1990+8)
=1990.(-8)+2.1990+16
=1990.{(-8)+2}+16
=1990.(-6)+2.8
=(-1990).3.2+2.8
=-5970.2+2.8
=2.{(-5970)+8}
=2.-5962
=−11924
Bài 1:
a.1990.1990-1992.1988
Gọi 1990 là a ta có:
1992=a+2
1988=a-2
\(\Rightarrow A=a^2-\left(a+2\right)\left(a-2\right)\)
\(\Rightarrow A=a^2-a^2-2a+2a-4\)
\(\Rightarrow A=-4\)
15.A+364A=697:1715.A+364A=697:17
15.A+364A=4115.A+364A=41
15+364A=4115+364A=41
364A=41−15364A=41−15
364A=26364A=26
A=364:26A=364:26
A=14A=14