计算:(1)-3-4+19-(+11)-(-2)(2)?22+(?2)4×(12)3?|?0.28|÷(?110)2(3)化简:3x2+(y?2x2)?

2025-05-09 11:59:59
推荐回答(1个)
回答1:

(1)-3-4+19-(+11)-(-2),
=-7+19-11+2,
=3;

(2)?22+(?2)4×(

1
2
)3?|?0.28|÷(?
1
10
)
2

=-4+16×
1
8
-0.28×100,
=-4+2-28,
=-30;

(3)3x2+(y?2x2)?
3
4
(4x2?6y)

=3x2+y-2x2-3x2+
9
2
y,
=-2x2+
11
2
y.