请教:小学奥数题,小数的运算技巧 ,请写出过程,谢谢!
1个回答
展开全部
=0.112×(37.5×21.5+35.5×12.5)
=0.112×(12.5×64.5+35.5×12.5)
=0.112×12.5×(64.5+35.5)
=11.2×12.5
=12.5×8×1.4
=100×1.4
=140
=0.112×(12.5×64.5+35.5×12.5)
=0.112×12.5×(64.5+35.5)
=11.2×12.5
=12.5×8×1.4
=100×1.4
=140
追问
谢谢您这么快回复,第二步64.5咋来的?12.5×64.5+35.5×12.5没看懂,请您解答一下,非常感谢您。
追答
是这样的 第一步=0.112×(12.5×3×21.5+35.5×12.5)
=0.112×【12.5×(3×21.5)+35.5×12.5】
=0.112×(12.5×64.5+35.5×12.5)
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