1.次の計算をせよ。
x+23+3x-12+3x
5a-4a+33+2a-36
m-n2-3m-4n6+2n
x+23+3x-12+3x
= 2(x+2)+3(3x-1)+6×3x6
= 2x+4+9x-3+18x6
= 29x+16
= 296x+16
5a-4a+33+2a-36
=6×5a-2(4a+3)+2a-36
=30a-8a-6+2a-36
=24a-96
=4a-32
m-n2-3m-4n6+2n
=3(m-n)-(3m-4n)+6×2n6
=3m-3n-3m+4n+12n6
=136n
