脱式计算，能简便计算的要简便计算（2.8+2.8+2.8+2.8）×0.25511×43%+511×57%（1-12-14）÷141.5×7.4+0.6×150%+2÷23．

Question

脱式计算，能简便计算的要简便计算
（2.8+2.8+2.8+2.8）×0.25
(5)/(11)×43%+(5)/(11)×57%
（1-(1)/(2)-(1)/(4)）÷(1)/(4)
1.5×7.4+0.6×150%+2÷(2)/(3)．

Answer 1

（1）（2.8+2.8+2.8+2.8）×0.25
=2.8×4×0.25
=2.8×（4×0.25）
=2.8×1
=2.8

（2）(5)/(11)×43%+(5)/(11)×57%
=(5)/(11)×（0.43+0.57）
=(5)/(11)×1
=(5)/(11)

（3）（1-(1)/(2)-(1)/(4)）÷(1)/(4)
=（1-(1)/(2)-(1)/(4)）×4
=1×4-(1)/(2)×4-(1)/(4)×4
=4-2-1
=1

（4）1.5×7.4+0.6×150%+2÷(2)/(3)
=1.5×7.4+0.6×1.50+2×1.5
=1.5×（7.4+0.6+2）
=1.5×10
=15