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a) 3 m 40 cm + 4 m 24 cm - 5 m 69 cm = 340 cm + 424 cm - 569 cm = 195 cm
b) 72 m 6 cm - 56 m 50 cm + 7 m 44 cm = 7206 cm - 5650 cm + 744 cm = 2300 cm
c) 8 m 27 dm + 3 m 35 cm + 3 m 65 cm = 1070 cm + 335 cm + 365 cm = 1770 cm
d) 98 m 20 cm x 2 + 23 m 30 cm x 2 = 9820 cm x 2 + 2330 cm x 2 = 19640 cm + 4660 cm = 24300 cm
e) 18 m 40 cm x 4 + 80 m 5 dm x 8 = 1840 cm x 4 + 8050 cm x 8 = 7360 cm + 64400 cm = 71760 cm
f) 87 m 23 dm : 2 = 8930 cm : 2 = 4465 cm
g) 9 m 8dm 7 cm : 3 = 987 cm : 3 = 329 cm
h) 90 dm 30 cm x 10 = 930 cm x 10 = 9300 cm
i) 19 dm 8 cm : 3 = 198 cm : 3 = 66 cm
j) 36 m 8 dm 7 cm : 3 = 3687 cm : 3 = 1229 cm
a) 3 m 40 cm + 4 m 24 cm - 5 m 69 cm = 340 cm + 424 cm - 569 cm = 195 cm
b) 72 m 6 cm - 56 m 50 cm + 7 m 44 cm = 7206 cm - 5650 cm + 744 cm = 2300 cm
c) 8 m 27 dm + 3 m 35 cm + 3 m 65 cm = 1070 cm + 335 cm + 365 cm = 1770 cm
d) 98 m 20 cm x 2 + 23 m 30 cm x 2 = 9820 cm x 2 + 2330 cm x 2 = 19640 cm + 4660 cm = 24300 cm
e) 18 m 40 cm x 4 + 80 m 5 dm x 8 = 1840 cm x 4 + 8050 cm x 8 = 7360 cm + 64400 cm = 71760 cm
f) 87 m 23 dm : 2 = 8930 cm : 2 = 4465 cm
g) 9 m 8dm 7 cm : 3 = 987 cm : 3 = 329 cm
h) 90 dm 30 cm x 10 = 930 cm x 10 = 9300 cm
i) 19 dm 8 cm : 3 = 198 cm : 3 = 66 cm
j) 36 m 8 dm 7 cm : 3 = 3687 cm : 3 = 1229 cm
Học tốt hem:)))![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$x-\frac{x}{3}\times \frac{3}{2}=2-\frac{1}{2}$
$x-x\times \frac{1}{2}=\frac{3}{2}$
$x\times (1-\frac{1}{2})=\frac{3}{2}$
$x\times \frac{1}{2}=\frac{3}{2}$
$x=\frac{3}{2}: \frac{1}{2}=3$
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3/25 x ( 15/7 - 2/7 ) + 3/7 x 1/25
= 3/25 x 13/7 + 3/7 x 1/25
= (3 x 13/7 + 3/7 ) x 1/25
= 42/7 x 1/25
= 6 x 1/25
= 6/25
\(\dfrac{3}{25}\times\dfrac{15}{7}+\dfrac{3}{7}\times\dfrac{1}{25}-\dfrac{2}{7}\times\dfrac{3}{25}\)
\(=\dfrac{3}{25}\times\left(\dfrac{15}{7}-\dfrac{2}{7}\right)+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3}{25}\times\dfrac{13}{7}+\dfrac{3}{7}\times\dfrac{1}{25}\)
\(=\dfrac{3\times13}{25\times7}+\dfrac{3\times1}{7\times25}\)
\(=\dfrac{39}{175}+\dfrac{3}{175}\)
\(=\dfrac{39+3}{175}\)
\(=\dfrac{42}{175}\)
\(=\dfrac{6}{25}\)
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mình gợi ý nè:
câu 2 bạn tính chu vi hình chữ nhật xong rồi tính nữa hình tròn => công lại hết là xong
câu 3 tương tự câu 2 nhưng tính diện tích r cộng lại nha!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(6:3,5-1\dfrac{1}{6}\times\dfrac{6}{7}\right):\left(4,2\times\dfrac{10}{11}+5\dfrac{2}{11}\right)\\ =\left(\dfrac{12}{7}-\dfrac{7}{6}\times\dfrac{6}{7}\right):\left(\dfrac{21}{5}\times\dfrac{10}{11}+\dfrac{57}{11}\right)\\ =\left(\dfrac{17}{7}-1\right):\left(\dfrac{42}{11}+\dfrac{57}{11}\right)\\ =\dfrac{10}{7}:9\\ =\dfrac{10}{63}\)
\(\left(6:\dfrac{3}{5}-1\dfrac{1}{6}\times\dfrac{6}{7}\right):\left(4,2\times\dfrac{10}{11}+5\dfrac{2}{11}\right)\)
\(=\left(6\times\dfrac{5}{3}-\dfrac{7}{6}\times\dfrac{6}{7}\right):\left(\dfrac{21}{5}\times\dfrac{10}{11}+\dfrac{57}{11}\right)\)
\(=\left(10-1\right):\left(\dfrac{42}{11}+\dfrac{57}{11}\right)=9:9=1\)