Toán Lớp 7: Bài 2: Rút gọn biểu thức
a,A=15(x-2)-(3x-4)+5
b,B=|x-2|-3(x-7)+21
c,C=4(x-1)-|7-3x|+2
D,D=5(x-3)-5|5-2x|-16
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Toán Lớp 7: Bài 2: Rút gọn biểu thức
a,A=15(x-2)-(3x-4)+5
b,B=|x-2|-3(x-7)+21
c,C=4(x-1)-|7-3x|+2
D,D=5(x-3)-5|5-2x|-16
Comments ( 1 )
a,A=15(x-2)-(3x-4)+5
b,B=|x-2|-3(x-7)+21
c,C=4(x-1)-|7-3x|+2
D,D=5(x-3)-5|5-2x|-16
giải
a)a, A=15(x-2)-(3x-4)+5
=> 15- 1 – (x-2)-(3x-4)+5
=> -x + 2x = 19 – 15 +3
=> ( -1 + 2 )x = 7
=> x = 7
b)-2x+40
c)7x-9
d)7x-56