第三大题第二小题怎么写?
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73.8-1.64-13.8-5.36
=(73.8-13.8)-(1.64+5.36)
=60-7
=53
3.6×102
=3.6×(100+2)
=3.6×100+3.6×2
=360+7.2
=367.2
66.86-8.66-1.34
=66.86-(8.66+1.34)
=66.86-10
=56.86
0.25×16.2×4
=0.25×4×16.2
=1×16.2
=16.2
3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35
36.8-3.9-6.12
=32.9-6.12
=26.78
5.48-(9.4-0.52)
=5.48+0.52-9.4
=6-9.4
=-3.4
4.8×7.8+78×0.52
= 4.8×7.8+7.8×5.2
=(4.8+5.2)×7.8
=10×7.8
=78
=(73.8-13.8)-(1.64+5.36)
=60-7
=53
3.6×102
=3.6×(100+2)
=3.6×100+3.6×2
=360+7.2
=367.2
66.86-8.66-1.34
=66.86-(8.66+1.34)
=66.86-10
=56.86
0.25×16.2×4
=0.25×4×16.2
=1×16.2
=16.2
3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35
36.8-3.9-6.12
=32.9-6.12
=26.78
5.48-(9.4-0.52)
=5.48+0.52-9.4
=6-9.4
=-3.4
4.8×7.8+78×0.52
= 4.8×7.8+7.8×5.2
=(4.8+5.2)×7.8
=10×7.8
=78
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