A.a(1+b)(1-b) | B.a(1+b)2 | C.a(1-b)2 | D.(1-b)(1+b) |
A.a(x-2)(x+1) | B.a(x+2)(x-1) | C.a(x-1)2 | D.(ax-2)(ax+1) |
A.(a-b)(a+b+c) | B.(a-b)(a+b-c) | C.(a+b)(a-b-c) | D.(a+b)(a-b+c) |
A.99×(57+44)=99×101=9 999 |
B.99×(57+44-1)=99×100=9 900 |
C.99×(57+44+1)=99×102=10 098 |
D.99×(57+44-99)=99×2=198 |
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