Question

用简便方法算一算 16乘125 48乘99 47乘101 58乘17+17乘42 35乘79+79+79乘64 367+367乘19

Answer 1

16乘125
=2×8×125
=2×1000
=2000
48乘99
=48×100-48
=4800-48
=4752
47乘101
=4700+47
=4747
58乘17+17乘42
=（58+42）×17
=100×17
=1700
35乘79+79+79乘64
=79×（35+1+64）
=79×100
=7900
367+367乘19
=367×（1+19）
=367×20
=7340

Answer 2

16x125=(8+8)x125=8x125+8x125=2000
48x99=48x(100-1)=48x100-48x1=4800-48=4752
47x101=47x(100+1)=47x100+47=4747
58x17+17x42=17x(58+42)=17x100=1700
35x79+79+79x64=79x(35+1+64)=79x100=7900
367+367x19=367x(1+19)=367x20=7340

Answer 3

16×125
=2×8×125
=2×1000
=2000
48×99
=48×(100-1)
=48×100-48
=4800-48
=4752
47×101
=47×(100+1)
=4700+47
=4747
58×17+17×42
=（58+42）×17
=100×17
=1700
35×79+79+79×64
=79×（35+1+64）
=79×100
=7900
367+367×19
=367×（1+19）
=367×20
=7340