What is nine fourths by three eighths? Seven twelfth by eight Sevens? Five sixteenth by eight nines? Eight out of eleven times 22 out of twelve? Six out of fifty-one times seventeen out of eight? Five out of twelve times three out of twenty? Seven eighths times () = () twenty-one fifths = () times () = 1

27/32
2/3
5/18
4/3
1/4
1/16

How to do the simple algorithm of 199.7 + 19.7 + 9.7 + 0.9

199.7+19.7+9.7+0.9
=200-0.3+20-0.3+10-0.3+0.9
=200+20+10-0.9+0.9
=230

2, 9, 16 and 36 are 19 points
Please add '+', subtract '-', and
Multiply '*' and divide '/' to calculate 2, 9, 16 and 36, and the result is 19

(36-16)/2+9

Simple calculation of (2 / 9 + 2 / 9) × 4 + 11 / 19
Come on!

(2 / 9 + 2 / 19) × 4 + 11 / 19
=2/9×4+2/19×4+11/19
=8/9+8/19+11/19
=8/9+（8/19+11/19）
=8/9+1
=1 and 8 / 9

After learning the knowledge of electric power, Xiao Ming wants to use his home watt hour meter (as shown in the figure) and watch to measure the relevant data of some household appliances. (1) when there is only one refrigerator in the home working normally, he measures that the watt hour meter turns three times in one minute, and finds out how many joules the refrigerator consumes during this period of time? (2) When the refrigerator and the electric kettle work at the same time, he measured the electric energy meter to rotate 33 times in one minute, and calculated the electric power of the electric kettle at this time?

(1) The electric energy consumed by the refrigerator is: W refrigerator = 31500kw · H = 31500 × 3.6 × 106j = 7200j; (2) it is known that when the refrigerator works for 1min, the electric energy meter turns 3R, the refrigerator and electric kettle work for 1min at the same time, and the electric energy meter turns 33 turns, the electric kettle works for 1min, turns 33r-3r = 30R, and the electric kettle works for 1

First simplify, then evaluate: 4x & # 178; Y - [6xy-2 (4xy-2) - XY & # 178;] + 1. Where x = - half, y = 2

4X & # 178; Y - [6xy-2 (4xy-2) - XY & # 178;] + 1 = 4x & # 178; Y - (6xy-8xy + 4-xy & # 178;) + 1 = 4x & # 178; y-6xy + 8xy-4 + XY & # 178; + 1 = 4x & # 178; y + 2XY + XY & # 178; + 1 = XY (4x + 2 + y) + 1 = (- 2) × 2 × [4 × (- 1 / 2) + 2 + 2] + 1 = - 4 × 2 + 1 = - 7

A is a major group element. 0.115g of a reacts with H2 to form ah. Ah reacts with water to form 112 ml of H2 under standard conditions. The atomic weight of a is calculated

It can be seen that if H2 is 0.005mol, then ah is 0.01mol, if a is monovalent, then a is 0.005mol, Ma = 23

A new operation △ is defined, which stipulates: a △ B = a × B + A + B, how much does 5 △ 8 equal first?

5x8+5+8=53

If the voltage applied to both ends of a fixed value resistor increases from 8V to 10V, and the current through the resistor changes by 0.1A, how much does the electric power of the resistor change?

1.8W

If a & # 8308; + B &; + A & # 178; B & # 178; = 5, ab = 2, find the value of a & # 178; + B & # 178

We can get a \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\theresult is: A & # 178; + B & # 178;) - # 178; = 3 & # 178; get: A & # 178; + B & # 178