The antonym of sending charcoal in the snow

The antonym of sending charcoal in the snow

Take advantage of others' danger
When you see a man falling into a trap, you don't reach out to save him. Instead, you push him down and throw down a stone
Add flowers to the cake (Note: Brocade: silk fabric with colorful patterns. Embroider on brocade again. It means adding good to good and adding beauty to beauty.)
When you see a man falling into a trap, you don't reach out to save him. Instead, you push him down and throw down a stone. It's like taking advantage of a fire to set up a man in danger

Find Antonyms: icing on the cake, half hearted, panic, timely help, engrossed, self-confident
This problem is not very difficult, but I still can't do it. Please help me!

Icing on the cake
Three minds and two minds
Panicked and flustered

Who knows the antonym of icing on the cake

Brocade: silk fabric with colorful patterns. Embroider on brocade. It is a metaphor of adding good to good and adding beauty to beauty. [from] song · Wang Anshi's poem Jishi: "if you want to cover the cup, Party C will still add brocade and flowers to it." song · Huang Tingjian's Ode to Le'an: "you need to praise Fu Weng, and the picture is icing on the cake."

How to calculate 876 △ 73 + 27 × 6?

876÷73+27×6
=（146×6）÷73+27×6
=146÷73×6+27×6
=（2+27）×6
=（30-1）×6
=30×6-1×6
=180-6
=174

501 by 99 and 78 by 101 should be Tuoshi, not one~

501 times 99
= 501 times 100-501
＝50100－501
＝49599
78 times 101
= 78 times 100 + 78
＝7800＋78
＝7878

Mathematics in grade four (within one hour)
1999*0.99*0.9

1781.109

Simple calculation of grade five in primary school
The fifth grade needs me to make it clear:
9.8×1.01
=.
=.
=.

9.8×1.01
=9.8×(1+0.01)
=9.8 × 1 + 9.8 × 0.01 is the law of multiplicative distribution
=9.8+0.098
=9.898

What bad luck!
It took me 20 points to raise this question last time, but I didn't raise it!
The title is like this: 1x1-2x2 + 3x3-4x4 + 5x5-6x6 +... + 2003x2003-2004x2004 + 2005x2005
It must be simple!
T_T
It's better to be a Tuoshi!

1x1-2x2+3x3-4x4+5x5-6x6+...+2003x2003-2004x2004+2005x2005 =1^2+(3^2-2^2)+(5^2-4^2)+...+(2005^2-2004^2)=1+(3-2)(3+2)+(5-4)(5+4)+...+(2005-2004)(2005+2004)=1+(3+2)+(5+4)+...+(2005+2004)=1+2+3+4+5+...+20...

Primary school fifth grade 40 simple arithmetic with answers

Calculation: 3 right 1 / 4 - (5.75-2 right 1 / 2) to process

3 and 1 / 4 - (1 / 2 right of 5.75-2)
=3 and 1 / 4-5.75 + 2 and 1 / 2
=-1 and 1 / 2 + 2 and 1 / 2
=1