简便运算 1.485-720除(15×12) 2.3.8×4.4+0.44×62 3.8×(1/48+125)

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简便运算 1.485-720除(15×12) 2.3.8×4.4+0.44×62 3.8×(1/48+125)

简便运算 1.485-720除(15×12) 2.3.8×4.4+0.44×62 3.8×(1/48+125)
简便运算 1.485-720除(15×12) 2.3.8×4.4+0.44×62 3.8×(1/48+125)

简便运算 1.485-720除(15×12) 2.3.8×4.4+0.44×62 3.8×(1/48+125)
1.485-720÷(15×12)
=485-720÷12÷15
=485-60÷15
=485÷4
=481
2.3.8×4.4+0.44×62
=38×0.44+0.44×62
=(38+62)×0.44
=100×0.44
=44
3.8×(1/48+125)
=8×1/48+8×125
=1/6+1000
=1000又1/6

1. 485-720除(15×12)
=485-720÷180
=485-4
=481
2. 3.8×4.4+0.44×62
=4.4x(3.8+6.2)
=44
3. 8×(1/48+125)
=1/6+8x125
=1000又1/6

3.8×4.4+0.44×62
=3.8×4.4+4.4×6.2
=(3.8+6.2)×4.4
=10×4.4
=44