16 out of 30 is 2 out of 15
16 / 30 △ 2 / 15 = 4
I'm a teacher. Thank you
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
Click comment in the upper right corner, and then you can select satisfied, the problem has been solved perfectly
If you have any new questions, please don't send them in the form of follow-up questions, send them to me for help or send them to the question link address,
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