Question

简便计算，怎样算才最简便，谢谢各位老师帮帮我

Answer 1

102 × 31 = （100 + 2）× 31 = 3100 + 62 = 3162
34 × 97 + 34 × 3 = 34 ×（97 + 3）= 34 × 100 = 3400
63 × 101 = 63 ×（100 + 1）= 6300 + 63 = 6363
63 + 9 × 63 = 63 ×（9 + 1）= 63 × 10 = 630
24 × 99 = 24 ×（100 - 1）= 2400 - 24 = 2376
20 × 54 - 20 × 4 = 20 ×（54 - 4）= 20 × 50 = 1000
103 × 12 = （100 + 3）× 12 = 1200 + 36 = 1236
101 × 38 - 38 = （101 - 1）×38 = 100 × 38 = 3800

Answer 2

102*31
=（100+2）*31
=100*31+2*31
=3100+62
=3162
63*101
=63*（100+1）
=63*100+63*1
=6300+63
=6363
24*99
=24*（100-1）
=24*100-24*1
=2400-24
=2376
34*97+34*3
=34*（97+3）
=34*100
=3400
63+99*63
=63*（99+1）
=63*100
=6300
20*54-20*4
=20*（54-4）
=20*50
=1000
103*12
=（100+3）*12
=100*12+3*12
=1200+36
=1236
101*38-38
=（100+1）*38-38
=100*38+1*38-38
=3800

Answer 3

100x31+2x31 34x(97+3) 63x100+63 63x(69+1) 24x100-24 20x(54-4) 100x12+12x3 (101+1)x38