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Độ dài đáy là : 52 + 12 = 64 ( cm )
Diện tích miếng bìa là :
64 x 52 = 3328 ( cm2)
Đáp số : 3328 cm 2
chiều cao của miếng bìa là:
( 185 - 35 ) : 2 = 75 ( cm )
Độ dài đáy của miếng bìa là:
185 - 75 = 110 ( cm )
Diện tích miếng bìa là:
110 x 75 = 8250 ( cm2 )
ĐS: 8250 cm2
110 x 75 =
chiều cao của miếng bìa là:
( 185 - 35 ) : 2 = 75 ( cm )
Độ dài đáy của miếng bìa là:
185 - 75 = 110 ( cm )
Diện tích miếng bìa là:
110 x 75 = 8250 ( cm2 )
ĐS: 8250 cm2
chiều cao miếng bìa hình bình hành là : ( 185 - 35 ) : 2 = 75 ( cm )
độ dài đáy miếng bìa hình bình hành là : 185 - 75= 110 (cm )
diện tích miếng bìa hình chữ nhật là : 110 x 75 = 8250 ( cm2 )
đáp số : 8250 cm2
Chiều cao của hình bình hành là :
( 185 - 35 ) : 2 = 75 ( cm )
Độ dài đáy của hình bình hành là :
185 - 75 = 110 ( cm )
Diện tích hình bình hành là :
75 x 110 = 8250 ( cm^ 2 )
ĐS : ..................
a) Hiệu số phần bằng nhau là:
5 - 3 = 2 (phần)
Độ dài đáy là:
28 : 2 x 5 = 70 (cm)
Chiều cao là:
28 : 2 x 3 = 42 (cm)
Đ/S: độ dài đáy: 70 cm
chiều cao: 42 cm
b) Diện tích HBH là:
70 x 42 = 2940 (cm2)
Đ/S: 2940 cm2
a) Độ dài đáy hình bình hành là:
28 : 2 x 5 = 70 ( cm )
Chiều cao hình bình hành là:
70 - 28 = 42 ( cm )
b) Diện tích miếng bìa hình bình hành là:
70 x 42 = 2940 ( cm\(^2\))
Đáp số: 2940 cm\(^2\)
chiều cao.
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