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简介:
(1)0.38×7.6+0.38÷2.5+0.38×2
=0.38×7.6+0.38×0.4+0.38×2
=0.38×(7.6+0.4+2)
=0.38×10
=3.8
(2)36×2.54+1.8×49.2
=1.8×20×2.54+1.8×49.2
=1.8×(20×2.54)+1.8×49.2
=1.8×(50.8+49.2)
=1.8×100
=180
(3)1994+199.4+19.94+1.994
=2000+200+20+2-6-0.6-0.06-0.006
=2222-6.666
=2215.334
(4)6.3+15.4+0.09+3.7+14.6
=(6.3+3.7)+(14.6+15.4)+0.09
=40+0.09
=40.09