（5）8.6×2.7+3.5×1.6 （6）(0.19×5.4＋2.6×0.19)×12.5 （7）9.99×2.22+3.34×3.33
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（5）8.6×2.7+3.5×1.6
=（10-1.4）×2.7+3.5×1.6
=10×2.7-1.4×2.7+7×0.8
=27-1.4×2.7+1.4×4
=27+1.4×（4-2.7）
=27+1.4×1.3
=27+1.82
=28.82
（6）(0.19×5.4＋2.6×0.19)×12.5
=0.19×（5.4+2.6）×12.5
=0.19×（8×12.5）
=0.19×100
=19
（7）9.99×2.22+3.34×3.33
=3.33×6.66+3.34×3.33
=3.33×（6.66+3.34）
=3.33×10
=33.3
（8）1.2除4.2的商，再加5与6.02的积，和是多少？
4.2÷1.2+5×6.02
=4.2÷0.6÷2+5×6+5×0.02
=7÷2+30+0.1
=3.5+30.1
=33.6
=（10-1.4）×2.7+3.5×1.6
=10×2.7-1.4×2.7+7×0.8
=27-1.4×2.7+1.4×4
=27+1.4×（4-2.7）
=27+1.4×1.3
=27+1.82
=28.82
（6）(0.19×5.4＋2.6×0.19)×12.5
=0.19×（5.4+2.6）×12.5
=0.19×（8×12.5）
=0.19×100
=19
（7）9.99×2.22+3.34×3.33
=3.33×6.66+3.34×3.33
=3.33×（6.66+3.34）
=3.33×10
=33.3
（8）1.2除4.2的商，再加5与6.02的积，和是多少？
4.2÷1.2+5×6.02
=4.2÷0.6÷2+5×6+5×0.02
=7÷2+30+0.1
=3.5+30.1
=33.6
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