-1-2 3-4 L-14 15 of 2 4-6 8-l 28-30 is equal to

-1-2 3-4 L-14 15 of 2 4-6 8-l 28-30 is equal to

-2+4-6+8-10.+28-30=（-2+4）+（-6+8）+.+(-26+28)-30=2*7-30=-16
1-2+3-4+5.-14+15=(1-2)+（3-4）+5.+（13-14）+15=7*（-1）+15=8
So the answer = - 8 / 16 = - 0.5

1−2+3−4+… −14+15−2+4−6+8−… +28−30=______ ．

The original formula = 15 − 14 + 13 − 12 + +3−2+1−30+28−26+24−22+… +8 − 6 + 4 − 2 = 15 − 7 − 30 + 14 × 2 = - 4

Given that a minus B equals 8, C plus C equals 10, and B plus C equals 15, what are a, B and C respectively

A-B = 8, C + C = 10, B + C = 15, C is: 10 △ 2 = 5, B is: 15-5 = 10, a is: 8 + 10 = 18

(3 √ 8 1 / 5 √ 50-4 √ 1 / 2) △ 32

(3 √ 8 1 / 5 √ 50-4 √ 1 / 2) △ 32
=（6√2+√2-2√2）÷4√2
=5√2÷4√2
=5/4
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x³-2x²+x (x²+4)²-16x²
(1)x³-2x²+x (2) (x²+4)²-16x²

（1）x(x-1)²
(2)(x²+4+4x)(x²+4-4x)=(x+2)²(x-2)²

(x minus 8) multiplied by 1.5 equals x plus 12 minus 8
Equation

x-8=x+12-8
x-x=12-8+8
Answer: this equation has no solution

A 1.5-meter-long cuboid wood has a square bottom. After sawing the wood into two sections, the surface area increases by 0.18 square decimeter

Bottom area: 0.18 △ 2 = 0.09 square decimeter
Bottom side length: 0.09 = 0.3 × 0.3
Bottom perimeter: 0.3 × 4 = 1.2 decimeters
1.5m = 15m
Side area: 1.2 × 15 = 18 square decimeters
Calculate the surface area of the original wood: 18 + 0.18 = 18.18 square decimeters

The quotient of even divided by odd must be even, right?

Analysis: (1) if it is an integer division, the quotient must be even,
Because the divisor = divisor x quotient, the quotient is even
(2) If not divisible, the quotient is a decimal or fraction

In the sequence an, A1 = 9, an + 1 = 3an + 3N + 2
(1) Let BN = an / 3N, prove that BN is an arithmetic sequence. (2) find the first n terms and Sn of an sequence
Wrong number, if an + 1 = 3an + 3 ^ n + 2

What does 3 ^ n + 2 mean? Is it 2 + 3 ^ n or 3 ^ (n + 2). If it's 3 ^ n + 2, please clarify the question. Otherwise, I can't do it. According to the question after the question, I'll answer it according to 3 ^ (n + 2). An + 1 = 3an + 3 ^ (n + 2), divide both sides of the equation by 3 ^ (n + 1), and get an + 1 / 3 ^ (n + 1) = A / 3 ^ n + 3

How to calculate the formula of 35 times 18 in a simple way

=35×(20-2)
=35×20-35×2
=700-70
=630