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a: \(24,8:0,5+24,8\cdot3+24,8:0,2\)
\(=24,8\cdot2+24,8\cdot3+24,8\cdot5\)
\(=24,8\left(2+3+5\right)\)
\(=24,8\cdot10=248\)
b: \(19,5+19,5\cdot3+19,5:0,5+19,5:0,25\)
\(=19,5+19,5\cdot3+19,5\cdot2+19,5\cdot4\)
\(=19,5\left(1+3+2+4\right)\)
\(=19,5\cdot10=195\)
c: \(121,07\cdot4+121,07:0,25+121,07:0,5\)
\(=121,07\cdot4+121,07\cdot4+121,07\cdot2\)
\(=121,07\left(4+4+2\right)\)
\(=121,07\cdot10=1210,7\)
co lam thi moi duoc khen ko lam ma doi duoc khen thif khen ca i dau ...khen cut
\(19,8:0,25.7,2:0,125.8,4:0,5\)
\(=19,8.4.7,2.8.8,4.2\)
\(=79,2.57,6.16,8\)
\(=76640,256\)
\(6,6.8.2,4.4.16,8:0,2\)
\(=52,8.9,6.84\)
\(=42577,92\)
a) $19,8:0,25.7,2:0,125.8,4:0,5$
$=19,8:\dfrac{1}{4}.7,2:\dfrac{1}{8}.8,4:\dfrac{1}{2}$
$=19,8.4.7,2.8.8,4.2=76640,256$
b) $6,6.8.2,4.4.16,8:0,2$
$=6,6.8.2,4.4.16,8:\dfrac{1}{5}$
$=6,6.8.2,4.4.16,8.5=42577,92$
x:0,25+x:0,01+x:0,5+x=214
\(\Rightarrow x\times4+x\times100+x\times2+x=214\)
\(\Rightarrow x\times\left(4+100+2+1\right)=214\)
\(\Rightarrow x\times107=214\)
\(\Rightarrow x=214:107\)
\(\Rightarrow x=2\)
x:0.25+x:0.01+x:0.5+x=214
x:(0.25+0.01+0.5+1)=214
x:1.76=214
x=214*1.76
x=376.64
Sửa đề :
X : 0,25 + x : 0,5 + x + x x 0,01 = 214
X x 4 + x x 2 + x x 1 + x + x 0,01 = 214
X x ( 4 + 2 + 1 + 100 ) = 214
X x 107 = 214
x = 214 : 107
x = 2
Mk làm cách ko sửa đề nha, thấy vẫn làm đc mà:
\(x:0,25+x:0,5+x+x+0,01=214\)
\(\Leftrightarrow x.4+x.2+x.1+x.1+0,01=214\)
\(\Leftrightarrow x.\left(4+2+1+1\right)+0,01=214\)
\(\Leftrightarrow x.8=214-0,01\)
\(\Leftrightarrow x.8=213,99\)
\(\Leftrightarrow x=213,99:8\)
\(\Leftrightarrow x=26,74875\)
X : 0,25 + X : 0,2 + X : 0,5 = 132
\(X\times4+X\times5+X\times2=132\)
\(X\times\left(4+5+2\right)=132\)
\(X\times11=132\)
\(X=132\div11=12\)