16 out of 30 is 2 out of 15

16 out of 30 is 2 out of 15

16 / 30 △ 2 / 15 = 4
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10 × 3.2 △ 4 / 15

=10x3.2x15/4
=10x0.8x15
=120

11 / 15-2 / 3 + 4 / 15 =?

13

Calculation - 5 √ 8 / 27 × √ 1 1 / 3 × √ 54

-5√8/27×√1 1/3×√54
=-5x√(8/27x54x4/3)
=-5x√(64/3)
=-(40√3)/3
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Calculate (1) √ 75 - √ 54 + √ 96 - √ 108; (2) (1 / 2) (√ 2 + √ 3) - (3 / 4) (√ 2 + √ 27)
calculation
(1)√75-√54+√96-√108;
(2)(1/2)(√2+√3)-(3/4)(√2+√27).

(1)√75-√54+√96-√108;
=5√3-3√6+4√6-6√3
=√6-√3
(2)(1/2)(√2+√3)-(3/4)(√2+√27).
=(1/2)√2+(1/2)√3-(3/4)√2-(3/4)3√3
=(-1/4)√2-(7/4)√3

27+29+38-54=

40

Simple calculation of 38 × 27 / 54 + 27 × 16 / 54

38×27/54+27×16/54
38×27/54+16×27/54
(38+16)×27/54
54×27/54
twenty-seven

Calculation of 38 ° 43 ′ + 27 ° 36 ′

38°43′+27°36′=66°19′

The area of a trapezoid is 3.44 square meters, its upper bottom is 1.5 meters, its height is 1.6 meters, how many meters is its lower bottom

Let the bottom be X
（1.5＋x）1.6/2=3.44
1.2+0.8x＝3.44
0.8x＝2.24
x＝2.8
A: the lower is 2.8 meters

The area of a trapezoid is 66 square meters, the bottom is 12 meters, the top is 8 meters, and the height is ()

66*2/(12+8)=6.6