\(\left(21\times x+3\right)\times4=84\)
\(\Rightarrow\left(21\times x+3\right)=84\div4\)
\(\Rightarrow\left(21\times x+3\right)=21\)
\(\Rightarrow21\times x=21-3\)
\(\Rightarrow21\times x=18\)
\(\Rightarrow x=18\div21\)
\(\Rightarrow x=\frac{6}{7}\)
\(\left(21\times x+3\right)\times4=84\)
\(\Rightarrow\left(21\times x+3\right)=84\div4\)
\(\Rightarrow\left(21\times x+3\right)=21\)
\(\Rightarrow21\times x=21-3\)
\(\Rightarrow21\times x=18\)
\(\Rightarrow x=18\div21\)
\(\Rightarrow x=\frac{6}{7}\)
Tìm x: a) 2x - 5x = -1/21 ÷ -5/84 _________ b) 1/2x - 2/3x + 1/5 = -3/4
311-x+82=46+x-21
-(x-3+84)=-x+70-71-5
Tìm x:
34+(21-x)=(3747-30)-3746
(x+153)-(48-193)=1-2-3-4
35-(x+5)=315-(2x+135)
213-(x+84)= -161
Tìm x
311-x+82=46+x-21
-(x-3+84)=-x+70-71-5
1) x+23-19+48= -50
2)3.x - 27 - 21 + 84 = 12
7\3 + 1\2 + -16\32
65\91 + -33\55
36\-84 + 109\450
4/20 + 16\42 + 6\10 + -3\5 + 2\21 + -10\21 + 3\10
5\12 + 3\-16 + 3\4
giải hộ mik với nha
84 : 4 + 27 : 21 + 5
Câu 1 : Tìm x,y,x biết : 12 / 16 = x/4 = 21/y= z/84
Câu 2 : Tìm x , y biết : x + 3 / y + 5 = 3/5
GIÚP MÌNH IK SẮP NỘP RÒI , MÌNH KICK CHO
a) (-52+213-85)-(-65+1937-1176)
b)125.(-16).(-5).(-8).2
c) (-84).127+21-(-84)-(-84) . 48
d) (-59)+174+59-175
giúp tui 4 câu này vs ạ ( cần gấp ạ )