简算难题,:24×205 672‐36﹢64 25+75‐25+75 5+263+55-198
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/06/28 16:56:23
简算难题,
:24×205 672‐36﹢64 25+75‐25+75 5+263+55-198 87-187-139-61 1280÷16÷8 88×125 (125+70)×8 4004×25
:24×205 672‐36﹢64 25+75‐25+75 5+263+55-198 87-187-139-61 1280÷16÷8 88×125 (125+70)×8 4004×25
![简算难题,:24×205 672‐36﹢64 25+75‐25+75 5+263+55-198](/uploads/image/z/2411221-13-1.jpg?t=%E7%AE%80%E7%AE%97%E9%9A%BE%E9%A2%98%2C%EF%BC%9A24%C3%97205+672%26%23173%3B%26%23173%3B%E2%80%9036%EF%B9%A264+25%2B75%E2%80%9025%2B75+5%2B263%2B55-198)
24×205
=24×(200+5)
=4800+120
=4920
672‐36﹢64
=672+(64-36)
=672+28
=700
25+75‐25+75
=75+75+25-25
=75+75
=150
5+263+55-198
=268-198+55
=70+55
=125
87-187-139-61
=87-187-(139+61)
=-100-200
=-300
1280÷16÷8
=1280÷(16×8)
=1280÷128
=10
8×125 =1000
(125+70)×8
=125×8+70×8
=1000+560
=1560
4004×25
=(4000+4)×25
=100000+100
=100100
再问: 8×125简算
再答: 呵呵,8×125=1000是必须背出来的。。 8×125=2×4×25×5 =2×5×(4×25) =10×100 =1000
再问: 是88×125
再答: 88×125=11×8×125 =11×1000 =11000
=24×(200+5)
=4800+120
=4920
672‐36﹢64
=672+(64-36)
=672+28
=700
25+75‐25+75
=75+75+25-25
=75+75
=150
5+263+55-198
=268-198+55
=70+55
=125
87-187-139-61
=87-187-(139+61)
=-100-200
=-300
1280÷16÷8
=1280÷(16×8)
=1280÷128
=10
8×125 =1000
(125+70)×8
=125×8+70×8
=1000+560
=1560
4004×25
=(4000+4)×25
=100000+100
=100100
再问: 8×125简算
再答: 呵呵,8×125=1000是必须背出来的。。 8×125=2×4×25×5 =2×5×(4×25) =10×100 =1000
再问: 是88×125
再答: 88×125=11×8×125 =11×1000 =11000