2加5等于几?等于7

2加5等于几?等于7 3加2等于几?7加2等于几? 7加2等于几? 2加5等于几 2加5等于几? 5加2等于几 5加2等于几 1加2加3加4加5加6加7加8加9等于几 几加3分之7等于5 5加91分之2等于几 1加1等于几 2加2等于几 1加1等于几,2加2等于几 1加1等于几,2加2等于几 1加1等于几 2加2等于几 1加1等于几2加22等于几 1加1等于几?1加2等于几? 8分之5加7分之2等于几 7加7等于几