Bonjour
1)8x-3x-9x. = 8x-12x = -4x
2)-4a+3a-7a. = -11a + 3a = -8a
3)-(4a+3a)-7a. = -(7a) -7a = -7a -7a = -14a
4)-4a-(3a-7a) = -4a -(-4a) = -4a +4a = 0
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Bonjour
1)8x-3x-9x. = 8x-12x = -4x
2)-4a+3a-7a. = -11a + 3a = -8a
3)-(4a+3a)-7a. = -(7a) -7a = -7a -7a = -14a
4)-4a-(3a-7a) = -4a -(-4a) = -4a +4a = 0