1樓:達爾尼
(1)(-4a5b3)2÷(8a2b3)?(-53a2),=16a10b6÷(8a2b3)?(-53a2),=2a8b3?(-53a2),
=-106a10b3;
(2)(x+2)2-(x+3)(x-3),=(x2+4x+4)-(x2-9),
=x2+4x+4-x2+9,
=4x+13;
(3)[(2x+1)(4x+2)-2]÷(-8x),=(8x2+8x+2-2)÷(-8x),
=(8x2+8x)÷(-8x),
=-x-1;
(4)[(2x-y)2+(2x+y)(2x-y)+8xy]÷2x,=(4x2-4xy+y2+4x2-y2+8xy)÷2x,=(8x2+4xy)÷2x,
=4x+2y,
當x=-3,y=2時,原式=4×(-3)+2×2=8.
計算下列各題,能簡算的要簡算.(1)19.2÷2.4×3.2(2)9.6×10.1(3)14.3÷1.1-
2樓:加菲23日
(1)19.2÷2.4×
3.2=8×3.2
=25.6;回
(2)答9.6×10.1
=9.6×10+9.6×0.1
=96+0.96
=96.96;
(3)14.3÷1.1-0.8
=13-0.8
=12.2;
(4)3.2×2.4+32×0.76
=3.2×2.4+3.2×7.6
=3.2×(2.4+7.6)
=3.2×10
=32.
計算下面各題,能簡算的要簡算,並寫出主要的計算過程.17.8-8.75+2.2-1.25213.2÷(9.4-5)+5.3231-
3樓:可樂
17.8-8.75+2.2-1.25,
=(7.8+2.2)-(8.75+1.25),=10-10,
=0;213.2÷(62616964757a686964616fe78988e69d83313333353331389.4-5)+5.32,
=13.2÷4.4+5.32,
=3+5.32,
=8.32;
31-3 7
-4 7
,=1-(3 7
+4 7
),=1-1,
=0;413
17-(5
17+1
10),
=13 17
-517
-1 10
,=8 17
-110
,=63
170;
51 5
+(5 6
-1318
),=1 5
+(15
18-13
18) ,
=1 5
+1 9
,=1445.
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