4.26x2.5÷1.5
=1.42x1.5x5÷1.5
=7.1
90.4÷2.26×7.07
=2.26×40÷2.26×7.07
=40×7.07
=282.8
第三题：2.24×0.18÷3.5
=7×0.32×0.18÷3.5
=2×0.32×0.18
=0.64×(0.2-0.02)
=0.128-0.0128
=0.1152