A,24/100+0,27+13/100+36% B,7,15:0,5+7,15x9-7,15
tính bằng cánh thuận tiện nhất
7,15:0,5+7,15x9-7,15
= 7,15 x 2 + 7,15 x 9 - 7,15
= 7,15 x (9 + 2 - 1)
= 7,15 x 10
= 71,5
`7,15:0,5+7,15xx9-7,15`
`=7,15xx2+7,15xx9-7,15`
`=7,15xx(2+9-1)`
`=7,15xx10=71,5`
`=7,15xx2+7,15xx9-7,15xx1`
`=7,15xx(2+9-1)`
`=7,15xx10=71,5`
tinh bằng cách thuận tiện:
A,18,95x75+24x18,95+18,95 B,23/100+47%+16/100=0,14
c.7,15:0,5+7,15x7+7,15
A, = 18,95 x (75 + 24 + 1) = 18,95 x 100 = 1895
c: =7,15x2+7,15x7+7,15=7,15x10=71,5
\(A,18,95\times75+24\times18,95+18,95\)
\(\text{= 18,95x ( 75 + 24 + 1)}\)
\(\text{= 18,95x x100}\)
\(\text{= 1895}\)
B,23/100+47%+16/100+0,14
\(=\dfrac{23}{100}+\dfrac{47}{100}+\dfrac{16}{100}+\dfrac{14}{100}\)
\(=\dfrac{100}{100}\)
\(=1\)
\(\text{c.7,15:0,5+7,15x7+7,15}\)
\(\text{= 7,15 x 2 + 7,15 x 7 + 7,15}\)
\(\text{= 7,15 x ( 2+7 + 1)}\)
\(\text{= 7,15 x 10}\)
\(\text{= 71,5}\)
Bài 5: Tính bằng cách thuận tiện nhất:
a) 6,25 + 8,75 + 3,75 + 1,25
b) 7,15 : 0,5 + 7,15 x 9 - 7,15
a) \(6,25+8,75+3,75+1,25=6,25+3,75+8,75+1,25=10+10=20\)
b) \(7,15:0,5+7,15x9-7,15=7,15x\left(1:0,5+7,19-1\right)=7,15x\left(2+9-1\right)=7,15x10=71,5\)
`@` `\text {Ans}`
`\downarrow`
`a)`
`6,25 + 8,75 + 3,75 + 1,25 `
`= (6,25 + 3,75) + (8,75 + 1,25)`
`= 10 +10 = 20`
`b)`
` 7,15 \div 0,5 + 7,15 \times 9 - 7,15 `
`= 7,15 \times 2 + 7,15 \times 9 - 7,15 \times 1`
`= 7,15 \times ( 2+ 9 - 1)`
`= 7,15 \times 10`
`= 71,5`
7,15 : 0,25 + 7,15 : 0,5 + 7,15 x 5 -7,15
`[` Tham Khảo `]`
`7,15 : 0,25 + 7,15 : 0,5 + 7,15 xx 5 -7,15`
`= 7,15 xx 4 + 7,15 xx 2 + 7,15 xx 5 -7,15xx1`
`= 7,15 xx (4+2+5-1)`
`=7,15 xx 10`
`=71,5`
\(\text{ }^{\dfrac{\text{7.15}}{\text{0.25}}}\) + \(\dfrac{\text{7.15}}{0.5}\) + 7,15.5 -7,15
=>71,5
7,15:0,5+7,15×9-7,15
`7,15:0,5+7,15xx9-7,15`
`=7,15xx2+7,15xx9-7,15`
`=7,15xx(2+9-1)`
`=7,15xx10`
`=71,5`
\(7,15:0,5+7,15\times9-7,15\\ =7,15\times2+7,15\times9-7,15\\ =7,15\times\left(2+9-1\right)\\ =7,15\times10\\ =71,5\)
7,15:0,5+7,15×9−7,157,15:0,5+7,15×9-7,15
=7,15×2+7,15×9−7,15=7,15×2+7,15×9-7,15
=7,15×(2+9−1)=7,15×(2+9-1)
=7,15×10=7,15×10
=71,5
#luan nguyen
7,15 : 0,5 + 7,15 x 9 – 7,15
=7.15x 2 + 7,15 x 9 - 7,15
Tính bằng cách thuận tiện
7,15 : 0,5 + 7,15 x 9 – 7,15
Tính bằng cách thuận tiện
7,15 : 0,5 + 7,15 x 9 – 7,15 = ?
7,15 : 0,5 + 7,15 x 9 – 7,15
= 7,15 x 2 + 7,15 x 9 – 7,15 x1
= 7,15 x ( 2 + 9 – 1)
= 7,15 x 10
= 71,5
trời, vậy 223654564566544 +34567 -34;10 bằng nhiêu?
tính bằng cách thuận tiện nhất
7,15: 0,5 + 7,15 x 9 - 7,15
\(7,15\div\times0,5+7,15\times9-7,15\\ =7,15\times2+7,15-7,15\\ =7,15\times\left(2+9-1\right)\\ =7,15\times10=71,5\)
`7,15 :0,5 + 7,15 xx 9 - 7,15`
`=7,15 xx 2+7,15 xx 9- 7,15 xx 1`
`=7,15 xx (2+9-1)`
`=7,15 xx 10`
`=71,5`
Ta có: \(7,15:0,5+7,15\cdot9-7,15\)
\(=7,15\cdot2+7,15\cdot9-7,15\)
\(=7,15\cdot10=71,5\)