第1个回答 2015-09-28
4.4*0.25的简便计算
=(4+0.4)*0.25
=4*0.25+0.4*0.25
=1+0.1
=1.1
0.26×5.5+2.6×0.45
=2.6×0.55+2.6×0.45
=2.6×(0.55+0.45)
=2.6×1
2.6
19.9×0.67
=0.67x(20-0.1)
=0.67x20-0.67x0.1
=13.4-0.067
=13.333
=0.8*12.5*32.4
=10*32.4
=324本回答被网友采纳
第2个回答 2015-09-28
4.4×0.25,
=1.1*(4*0.25)
=1.1*1
=1.1
0.26×5.5+2.6×0.45,
=0.26*(5.5+4.5)
=0.26*10
=2.6
19.9×0.67,
=(20-0.1)*0.67
=20*0.67-0.1*0.67
=13.4-0.067
=13.333
0.8×32.4×12.5
=0.8*12.5*32.4
=10*32.4
=324
第3个回答 2015-09-28
4.4×0.25
=4.4X1/4
=1.1
0.26×5.5+2.6×0.45
=0.26x(5.5+4.5)
=2.6
19.9×0.67
=20x0.67-0.67x0.1
=13.4-0.067
=13.333
0.8×32.4×12.5
=0.8x12.5x32.4
=10x32.4
=324