题目内容
计算
(1)﹣4﹣28﹣(﹣29)+(﹣24);
(2)
;
(3)
;
(4)
;
(5)4x﹣(x﹣3y);
(6)5(3a2b﹣ab2)﹣4(﹣ab2+3a2b).
(1)﹣4﹣28﹣(﹣29)+(﹣24);
(2)
(3)
(4)
(5)4x﹣(x﹣3y);
(6)5(3a2b﹣ab2)﹣4(﹣ab2+3a2b).
解:(1)原式=﹣32+29﹣24,
=﹣56+29,
=﹣27;
(2)原式=﹣
×(﹣
)÷(﹣
),
=
×(﹣
),
=
;
(3)原式=﹣1÷25×(﹣
)+0.2,
=﹣
×(﹣
)+
,
=
;
(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.
=﹣56+29,
=﹣27;
(2)原式=﹣
=
=
(3)原式=﹣1÷25×(﹣
=﹣
=
(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.
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