填一填．
70+70+70+70=________×________=________
51×4=________×________+________×________=________+________=________
700+700+700=________×________=________
3×400=________+________+________=________
________×________=90+90+90+90=________．
网友回答
70 4 280 50 4 1 4 200 4 204 700 3 2100 400 400 400 1200 90 4 360
解析分析：根据整数加法的意义和乘法的意义进行解答即可．
解答：70+70+70+70=70×4=280
51×4=50×4+1×4=200+4=204
700+700+700=700×3=2100
3×400=400+400+400=1200
90×4=90+90+90+90=360．
故