求教数学题,递等式计算,能巧算的要巧算:
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求教数学题,递等式计算,能巧算的要巧算:
42x36÷24x17=?
36x63-63x34=?
25x{40+8}x125=?
637-252÷21+412=?
25x4÷25x4=?
42x36÷24x17=?
36x63-63x34=?
25x{40+8}x125=?
637-252÷21+412=?
25x4÷25x4=?
![求教数学题,递等式计算,能巧算的要巧算:](/uploads/image/z/16847312-32-2.jpg?t=%E6%B1%82%E6%95%99%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%2C%E8%83%BD%E5%B7%A7%E7%AE%97%E7%9A%84%E8%A6%81%E5%B7%A7%E7%AE%97%EF%BC%9A)
42x36÷24x17
=1512÷24×17
=63×17
=1071
36x63-63x34
=﹙36-34﹚×63
=2×63
=126
25x{40+8}x125
=﹙25×40+25×8﹚×125
=﹙1000+200)×125
=1200×125
=1500
637-252÷21+412
=637-12+412
=637+400
=1037
25x4÷25x4
=100÷25×4
=4×4
=16
=1512÷24×17
=63×17
=1071
36x63-63x34
=﹙36-34﹚×63
=2×63
=126
25x{40+8}x125
=﹙25×40+25×8﹚×125
=﹙1000+200)×125
=1200×125
=1500
637-252÷21+412
=637-12+412
=637+400
=1037
25x4÷25x4
=100÷25×4
=4×4
=16