问题
解答题
计算 (1)-4-28-(-29)+(-24); (2)-
(3)-14÷(-5)2×(-
(4)[50-(
(5)4x-(x-3y); (6)5(3a2b-ab2)-4(-ab2+3a2b). |
答案
(1)原式=-32+29-24,
=-56+29,
=-27;
(2)原式=-
×(-3 4
)÷(-3 2
),9 4
=
×(-3 2
),4 9
=-
;1 2
(3)原式=-1÷25×(-
)+0.2,5 3
=-
×(-1 25
)+5 3
,1 5
=
;4 15
(4)原式=(50-28+33-6)÷49,
=49÷49,
=1;
(5)原式=4x-x+3y,
=3x+3y;
(6)原式=15a2b-5ab2+4ab2-12a2b,
=3a2b-ab2.