语:写出歌咏西湖的诗句。(作者)
数:(过程) ①10-(-6)+(-3)-1
②-5+7-4+2
和拼同类项: ③5ab+4ab-3ab
计算 ④1/2(10x-0.5)
⑤-1/3(9y-4)
⑥-2(x-1)-5
⑦a-(a-b)
⑧(2a+1)+(4a-3)
语:写出歌咏西湖的诗句。(作者)
数:(过程) ①10-(-6)+(-3)-1
②-5+7-4+2
和拼同类项: ③5ab+4ab-3ab
计算 ④1/2(10x-0.5)
⑤-1/3(9y-4)
⑥-2(x-1)-5
⑦a-(a-b)
⑧(2a+1)+(4a-3)
④1/2(10x-0.5)=0.5x10x-0.5x0.5
=5x-0.25
数学:
①10-(-6)+(-3)-1
解:10-(-6)+(-3)-1
=10+6-3-1
=12
②-5+7-4+2
解:-5+7-4+2
=2-4+2
=-2+2
=0
③5ab+4ab-3ab
解:5ab+4ab-3ab
=(5+4-3)ab
=6ab