simplify each expression

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simplify each expression
1.4（b+8）-7b 2.-8（m+2)-19m 3.4.3（5.6+c）+9c
4.83x+15（x-17) 5.3-5(a-4） 6.-5b-2（b-1）
7.16-4(c+3) 8.4x-8(2x+7) 9.9-(2b-6）
10.21z-（15z+10）
例：7（t+8.5）-5t+3=7t+59.5-5t+4
=7t-5t+59.5+4
=2t +63.5
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write two different expression that can be simplified to 3m+8.One expression should have three terms,and the other should have four terms.
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Does 5ab=5a +5b?Explain
麻烦请在9点半前回答，实在不行 write two different expression that can be simplified to 3m+8。One expression should have three terms，and the other should have four terms。
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1.4（b+8）-7b=4b+32-7b=32-3b
2.-8（m+2)-19m=-8m-16-19m=-27m-16
3.4.3（5.6+c）+9c=24.08+4.3c+9c=24.08+13.3c
4.83x+15（x-17)=83x+15x-255=98x-255
5.3-5(a-4）=3-5a+20=20-2a
6.-5b-2（b-1）=-5b-2b+2=2-7b
7.16-4(c+3)=16-4c-12=4-4c
8.4x-8(2x+7)=4x-16x-56=-12x-56
9.9-(2b-6）=9-2b+6=15-2b
10.21z-（15z+10)=21z-15z-10=6z-10
3(m+2)+2=3m+6+2=3m+8
2(m-2)+m+12=2m-4+m+12=3m+8
5a+5b=5(a+b)
当a=b=0 或a=b=2 时
ab=a+b=0 或 ab=a+b=4
则 5ab=5a+5b=0 或 20
若a、b不同时等于0或2
显然 ab≠a+b
那么 5ab≠5a+5

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