Question

1.3.8x4.2+0.38x58

Answer 1

1.3.8x4.2+0.38x58=0.38×（42+58）=38

2.1.2×（0.46+0.54）=1.2

3.5.5×48+5.5×52=5.5×（48+52）=550

4.3.7×0.72+3.7×0.28=3.7×（0.28+0.72）=3.7

5.190×2+213×2=806

6.7.3×4+4×25.2=4×32.5=130

7.0.112×（12.5×64.5+12.5×35.5）=0.112×1250=140