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How to do the second question on page 90 of the first volume of mathematics in senior one?
On page 90 of the first volume of Grade One Mathematics, the second question is to find a rule to fill in the number 5+5+5 = (5). The title of page 90 of the first volume of senior one mathematics is regular number filling, and the answer is 4+4+4 = (4). 5+5+5=(5)。 (6)+(6)+(6)=( 18)。 12-4-4-4=0。 15-5-5-5=0。 18-(6)-(6)-(6)=(0)。 2+5+3= 10。 5+ 1+9= 15。 8+3+7= 18, 10+40+30=(80)。 20+ 10+(30)=60。 (40)+30+20=90。