Question

脱式计算．（能简算的就简算）9.4÷[（1.2+1.3）÷0.25]（1.2+1.8

脱式计算．（能简算的就简算）9.4÷[（1.2+1.3）÷0.25]（1.2+1.8×4）×（7-6.75）2.65×1.7+13.5×0.1720.4-0.8×0.4-0.68．

Answer 1

（1）9.4÷[（1.2+1.3）÷0.25]
=9.4÷[2.5÷0.25]
=9.4÷10
=0.94

（2）（1.2+1.8×4）×（7-6.75
=（1.2+7.2）×0.25
=8.4×0.25
=2.1

（3）2.65×1.7+13.5×0.17
=2.65×1.7+1.35×1.7
=（2.65+1.35）×1.7
=4×1.7
=6.8

（4）20.4-0.8×0.4-0.68
=20.4-0.32-0.68
=20.4-（0.32+0.68）
=20.4-1
=19.4