6 szkoły podstawowej

Matematyka z plusem 6

x + x + 5 + (-1) + 2x + 3 + (-3) + (-x) = x + x + 2x - x - 1 - 3 + 5 + 3 = 4x - x - 4 + 8 = 3x + 4

a) −5t+t−6−7t+8t+2+2t=−5t+t−7t+8t−6+2+2t=−4t+t−4+2t=−3t−4+2t=−t−4

n+1+21​n⋅2+21​n⋅1=n+1+n+21​n=221​n+1

20n+15m+2⋅20n+21​⋅15m=20n+15m+40n+7,5m=60n+22,5m