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计算(1)24×(18−13+14)(2)(-4)-(+13)+(-5)-(-9)(3)-32×(-2)+42÷(-2)3(4)(4)-12-[137+(-12)÷6]2×(−34)3(5)3x2+2xy-4y2-(3xy-4y2+3x2)(6)(4a2b-5ab2)-(3a2b-4ab2)

题目详情
计算
(1)24×(
1
8
1
3
+
1
4
)
(2)(-4)-(+13)+(-5)-(-9)
(3)-32×(-2)+42÷(-2)3(4)
(4)-12-[1
3
7
+(-12)÷6]2×(−
3
4
)3
(5)3x2+2xy-4y2-(3xy-4y2+3x2)  
(6)(4a2b-5ab2)-(3a2b-4ab2
▼优质解答
答案和解析
(1)原式=24×
1
8
-24×
1
3
+24×
1
4
=3-8+6=1;
(2)原式=-4-13-5+9=-22+9=-13;
(3)原式=-9×(-2)+16÷(-8)=18-2=16;
(4)原式=-1-(1
3
7
-2)2×(-
27
64
)=-1-
16
49
×(-
27
64
)=-1+
27
196
=
169
196

(5)原式=3x2+2xy-4y2-3xy+4y2-3x2=-xy;
(6)原式=4a2b-5ab2-3a2b+4ab2=a2b-ab2