Question

脱式计算，能简便的要用简便计算．2.08×3.4-7.064.3×0.25×0.4104×0.250.78×0.17-0.12×0.784.2×7.8

脱式计算，能简便的要用简便计算．2.08×3.4-7.064.3×0.25×0.4104×0.250.78×0.17-0.12×0.784.2×7.8+2.2×4.29.5×1010.87×3.16+4.640.48×1.251.01×8.558.36×0.5+18.20.25×5.8×0.4．

Answer 1

（1）2.08×3.4-7.06
=7.072-7.06
=0.012

（2）4.3×0.25×0.4
=4.3×（0.25×0.4）
=4.3×0.1
=0.43


（3）104×0.25
=100×0.25+4×0.25
=25+1
=26


（4）0.78×0.17-0.12×0.78
=0.78×（0.17-0.12）
=0.78×0.05
=0.039


（5）4.2×7.8+2.2×4.2
=4.2×（7.8+2.2）
=4.2×10
=42


（6）9.5×101
=9.5×100+9.5×1
=950+9.5
=959.5

（7）0.87×3.16+4.64
=2.7492+4.64
=7.3892

（8）0.48×1.25
=0.6×0.8×1.25
=0.6×（0.8×1.25）
=0.6×1
=0.6

（9）1.01×8.5
=1×8.5+0.01×8.5
=8.5+0.085
=8.585

（10）58.36×0.5+18.2
=29.18+18.2
=47.38

（11）0.25×5.8×0.4
=0.25×0.4×5.8
=0.1×5.8
=0.58