1。0.25X(3.8+3.8+3.8+3.8)
=0.25X(4x3.8)
=(0.25x4)x3.8
=1x3.8
=3.8.
2。10.01X101-10.01
=10.01X(101-1)
=10.01X100
=1001.
0.25×(3.8+3.8+3.8+3.8+3.8)
=0.25×(3.8×5)
=0.25×3.8×5
=0.25×(4-0.2)×5
=5×0.25×4-5×0.25×0.2
=5-5×0.2×0.25
=5-0.25
=4.75
好吧我多看了个3.8
0.25×(3.8+3.8+3.8+3.8)
=0.25×4×3.8
=3.8
10.01×101-10.01
=10.01×101-10.01×1
=10.01×(101-1)
=10.01×100
=1001
😳好难