Question

脱式计算，能简算的要简算①2.9×1.4+2×1.6②（2.44-1.8）÷0

脱式计算，能简算的要简算①2.9×1.4+2×1.6②（2.44-1.8）÷0.4×20③4.6×9+4.6．

Answer 1

①2.9×1.4+2×1.6，
=4.06+3.2，
=7.26；

②（2.44-1.8）÷0.4×20，
=0.64÷0.4×20，
=1.6×20，
=32；

③4.6×9+4.6，
=4.6×9+4.6×1，
=（9+1）×4.6，
=10×4.6，
=46．