3/5+29×3/5
=3/5×(1+29)
=3/5×30
=18
3/7×21+4/7×21
=(3/7+4/7)×21
=1×21
=21
2/3×1/2+0.5
=(2/3+1)×1/2
=5/3×1/2
=5/6
3/4×2/3×5/8
=1/2×5/8
=5/16
B. 簡便運算4年級簡便運算大全
280×36-360×18
=(280-180)×36
=100×36
=3600
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C. 小學四年級,112除4除28怎麼樣簡便計算
112除以4除以28即:
112/陸此銷4/28
=112/(4*28)
=112/112
=1
在除法里從前往後讀除號讀除以,從後往前早游除號讀扒野除112除4除28即:28/4/112
=7/112
=1/16