华东师大版八年级上册数学第12章12.2部分单项式与单项式相乘学法大视野答案(3)
11课堂训练第5题答案
S阴影=(2ab+3ab)×(2ab+3ab)-3ab×+ab
=8ab×5ab-9a2b2
=31a2b2
12课后提升选择题答案
1 | 2 | 3 | 4 | 5 |
C | C | C | D | A |
13课后提升第6题答案
2m10
14课后提升第7题答案
2
15课后提升第8题答案
10
16课后提升第9题答案
(1)4xy2·[(-1/2)x2yz]=[4×(-1/2)]·x1+2y2+1z=-2x3y3z
(2)(0.3x3y4)2·( - 0.2x4y3)2= 0.09x6y8·0.04x8y6 = (0.09×0.04)x6+8y8+6 = 0.0036x14y14
(3)原式=[-5/3×3/5×(-7/8)]×(a2·a·a)×(b·b2·b)×(c·c·c2)=(7/8)a4b4c4
(4)(2ab)2(x-y)10×(2a3b4)(x-y)9= 4a2b2 (x-y)10× (2a3b4)(x-y)9=8a5b6(x-y)19