1.25x497x0.8
=1.25x0.8x497
=1X497
=497
运用乘法交换律运算
1.25×497×0.8
=(0.125×8)×497
=1×497
=497
=1.25×0.8×497
=1×497
=497
方法一:
4978.4978÷49.78×497.8
=4978.4978÷(49.78÷497.8)
=4978.4978÷0.1
=49784.978
方法二:
4978.4978÷49.78×497.8
=4978×1.0001÷49.78×497.8
=4978÷49.78×497.8×1.0001
=100×497.8×1.0001
=4978×10×1.0001
=4978.4978×10
=49784.978