Question

简便运算:①， 7.5÷4+2.5×1/4

② 2.25x1.8+2.5×0.18
③ 3.68-0.82-0.18
④ 【1-(5/6)】×12
⑤ 3/5÷4/3+2/5×75%
⑥ 30×1/4-0.6×7.7-60%×2.3

快点！一定要准确，快速，一定要简便运算

Answer 1

①， 7.5÷4+2.5×1/4
=7.5×1/4+2.5×1/4
=（7.5+2.5）×1/4
=2.5
② 2.25x1.8+2.5×0.18
=22.5x0.18+2.5×0.18
=0.18x(22.5-2.5)
=0.18x20
=3.6
③ 3.68-0.82-0.18
=3.68-(0.82+0.18)
=3.68-1
=2.68
④ 【1-(5/6)】×12
=1x12-5/6x12
=12-10
=2
⑤ 3/5÷4/3+2/5×75%
=3/5x75%+2/5x75%
=0.75x(3/5+2/5)
=0.75
⑥ 30×1/4-0.6×7.7-60%×2.3
=15/2-0.6×(7.7+2.3)
=7.5-0.6×10
=7.5-6
=1.5

追问

第二题错了吧，答案是4.5哦

追答

② 2.25x1.8+2.5×0.18
=22.5x0.18+2.5×0.18
=0.18x(22.5+2.5)
=0.18x25
=4.5